ORAL HYGIENE MEANS

PRIOR ART

[0001]The invention concerns an oral hygiene means, in particular a toothbrush.

[0002]From WO 2016/177580 A1, WO 2007/030958 A1 and WO 2021/069693 A2, an oral hygiene means, in particular a toothbrush, is already known, with at least one application unit which has a base body, and with at least one handle unit, in particular a manual handle unit, which has a base body.

[0003]The objective of the invention is in particular to provide a generic oral hygiene means having improved properties with regard to longevity, production method, ergonomics, manageability and/or ecology. The objective is achieved according to the invention by the features of patent claim 1 while advantageous implementations and further developments of the invention may be gathered from the subclaims.

[0004]The objective of the invention is in particular to provide of a sustainable toothbrush with excellent handling. The invention may be realized with individual or with combined sub-aspects, according to the criteria listed below.

Advantages of the Invention

[0005]The invention is based on an oral hygiene means, in particular a toothbrush, with at least one application unit which has a base body, and with at least one handle unit, in particular a manual handle unit, which has a base body.

[0006]It is proposed that the oral hygiene means comprises at least one coupling unit for a releasable coupling of the application unit with the handle unit, the coupling unit comprising a first coupling element which is fixedly connected with the handle unit, and a second coupling element which corresponds to the first coupling element and is fixedly connected with the application unit, wherein the first coupling element delimits at least one orientation groove extending at least substantially along a main extension direction of the handle unit, and the second coupling element comprises at least one inside-situated guide ridge extending at least substantially along a main extension direction of the application unit and configured to engage in the orientation groove in a coupled state of the coupling unit. The base body of the application unit in particular consists of the neck region and a head region. Alternatively, the neck region may at least partially be part of the handle unit. In that case, the application unit would be realized correspondingly shorter and in an extreme case would consist only of the brush head. The application unit is in particular realized as a plug-on part. The application unit is in particular realized as a plug-on brush.

[0007]In principle, however, other implementations of the application unit, deemed expedient by someone skilled in the art, would also be conceivable. The handle unit is in particular realized in a one-part implementation. However, a multi-part implementation of the handle unit would also be conceivable. It would herein in particular be conceivable that several components are manufactured and then connected, for example in order to create geometries which can only be produced in a multi-part implementation, for example due to undercuts or the like.

[0013]The implementation according to the invention of the oral hygiene means allows providing advantageous properties with regard to the sustainability and the ergonomics of the oral hygiene means. In particular, advantageous grippability of the handle unit over an entire handle region is achievable. It is furthermore in particular possible to provide an advantageously long-life handle unit, wherein the application unit is in particular designed to be exchangeable. It is furthermore possible to provide advantageously high robustness of the handle unit. Moreover, a long service life of the handle unit is achievable, wherein in particular only the application unit needs to be exchanged. As a result, it is in particular possible to provide an ecologically advantageous oral hygiene means. Furthermore, this in particular allows keeping a material volume of the handle unit small, in particular without affecting ergonomics and manageability, in particular grippability, of the oral hygiene means. In particular, material input for the oral hygiene means can be kept low. This in particular allows providing an advantageously ecological, respectively sustainable, oral hygiene means.

[0014]Preferably, the application unit and the handle unit differ material-wise. The application unit and the handle unit may also have different surfaces (e. g. in terms of surface structure, surface roughness, friction coefficient, etc.). Different production methods and/or different materials will in particular result in different surfaces. Of course, the surface characteristics may also be adapted in such a way that the same surface is created quasi-continuously. Abrasion and/or wear of the application unit during exchange, respectively removal and plugging on, of the application unit is furthermore in particular greater than abrasion of the handle unit, such that durability of the handle unit is achievable and multiple use, in particular multiple exchange of the application unit, is enabled. The selection of materials for handle unit and application unit is designed accordingly.

[0015]An “oral hygiene means” is in particular to mean a toothbrush and/or an interdental cleaner and/or a flosser and/or a tongue cleaner and/or a toothpick. Advantageously, the oral hygiene means is embodied as a toothbrush, in particular a manual toothbrush, preferably a children's or adults' toothbrush, advantageously a purely manual toothbrush. Alternatively, the oral hygiene means may also be equipped with electrical components, such as e. g. a battery and/or a vibrating drive and/or a lighting element, etc. The oral hygiene means is in particular embodied as an exchangeable-head toothbrush. However, it is also conceivable that the application unit has an implementation different from a brush head, such as for example as an interdental cleaner head, in particular for an interdental brush with twisted-in bristles, for an interdental cleaner with injection-molded cleaning elements and/or for interdental cleaners with dental floss, such as in particular flossers, and/or as a tongue cleaner head and/or as a toothpick. However, it is also possible for the oral hygiene means to be generally realized as a brush product. A “brush product” is in particular to mean an oral hygiene brush and/or a cosmetics brush and/or a hair brush and/or a household brush. For example, manual toothbrushes, such as reusable toothbrushes, exchangeable-head toothbrushes, disposable toothbrushes or single-tuft brushes, interdental cleaners, in particular with twisted-in bristles, in injection-molded form, as an electrical toothbrush with a vibrating drive or as a flosser, tongue cleaner and/or dental floss, are conceivable as oral hygiene brushes. For example, mascara brushes, nail varnish brushes, facial brushes, applicators, in particular also hair-dyeing applicators, massaging devices, make-up brushes, shaving brushes and/or wet shavers or other body care products are conceivable as cosmetics brushes, respectively cosmetics means. For example, dish-washing brushes or bottle cleaners are conceivable as household brushes. The application unit is designed according to the implementations mentioned. In this document brushes, e. g. plug-on brushes, are referred to by way of example. However, the application possibilities mentioned above are also possible analogously.

[0016]The application unit is in particular realized as a plug-on brush, and/or with one of the application heads mentioned above. Preferably, the application unit is in particular made of at least one plastic. The application unit may be made, for example, of a transparent plastic in order to make the interface geometry and/or the engagement of the handle unit in the application unit visible. In particular, a visualization of the technicality could be achieved in order to convey the plug-on and/or pull-off process to the user in a simple manner (e.g. rotating, pulling, snapping or a combination thereof, and/or the preferred orientation of handle unit and/or application unit during a connection process).

[0017]Furthermore, an operability can be shown in a comprehensible manner. Alternatively, the application unit may be made at least partially of an organic material such as, for example, wood, cork or bamboo. Thus, in particular the head may be made of wood, cork or bamboo, wherein in particular the coupling unit would have to be adapted accordingly.

[0018]Besides plastic, the handle unit may also be produced in particular from materials such as wood, glass or metal. In particular if an exchangeable head is realized, the handle unit may advantageously be made of hard materials as these do not come into contact with the teeth.

[0019]The oral hygiene means in particular has a longitudinal axis, which is advantageously arranged at least substantially parallel to a main extension direction of the oral hygiene means. The longitudinal axis preferably runs at least section-wise within the oral hygiene means and in particular through its center of gravity. In particular, the longitudinal axis of the oral hygiene means is a middle axis of the oral hygiene means and/or a middle axis of the handle unit. A “middle axis” of an object is in particular to mean an imaginary axis which runs inside the object parallel to a main extension direction of the object, intersecting with the object in at most two points. “At least substantially parallel” is in particular to mean an orientation of a direction relative to a reference direction, in particular in a plane, wherein the direction differs from the reference direction in particular by less than 8°, advantageously by less than 5° and particularly advantageously by less than 2°. A “main extension direction” of an object is in particular to mean a direction which runs parallel to a longest edge of a smallest imaginary cuboid just still completely enclosing the object. A “main extent” of an object is in particular to mean, in this context, an extent of a longest edge of a smallest imaginary cuboid just still completely enclosing the object.

[0020]In particular, the oral hygiene means has a length, in particular parallel to the longitudinal axis of the oral hygiene means and measured parallel to the contact surface, of 130 mm to 210 mm and preferably of 180 mm to 200 mm, wherein of course other, in particular smaller or larger, lengths are also conceivable. Smaller implementations may be used for children's or teens' toothbrushes. The proportions specified in this document are essentially complied with in these cases. In particular, the oral hygiene means has a maximum width, in particular parallel to a width axis of the oral hygiene means, advantageously perpendicular to the longitudinal axis and/or parallel to a main extension plane of the oral hygiene means and/or of the handle unit, of 10 mm to 20 mm and preferably of 12 mm to 17 mm. The oral hygiene means preferably has a widest point in the region of a thumb grip and further has a wide portion towards a lower end. In particular, the oral hygiene means has a minimum width of 4 mm to 10 mm, preferably of 4.5 mm to 7 mm, in a neck region of the application unit. Furthermore, the oral hygiene means in particular has a thickness without bristles, in particular measured parallel to the height axis and perpendicular to a support surface, of 10 mm to 17 mm and preferably of 12 mm to 15 mm. The highest point is in particular in a thumb-gripping region or a holding region of the handle unit of the oral hygiene means. The term “thickness” herein in particular refers to a state of the oral hygiene means in which it is deposited, for example on a flat surface such as a tabletop, a washbasin, a furniture top or the like, in particular such that the longitudinal axis is arranged parallel to the surface and the rear side of the oral hygiene means rests on the flat surface. A “main extension plane” of an object is in particular to mean a plane which is parallel to a largest side surface of a smallest imaginary cuboid just still completely enclosing the object, and which extends through the center of the cuboid.

[0021]The handle unit, in particular with a first coupling element of the coupling unit, in particular has a length, in particular parallel to the longitudinal axis of the oral hygiene means and measured parallel to the support surface, of 120 mm to 170 mm and preferably of 140 mm to 160 mm, wherein of course other, in particular smaller or larger, lengths are also conceivable. The ratio of this length of the handle unit to a total length of the oral hygiene means is in particular 50% to 80%, preferably 55% to 75%.

[0022]The application unit advantageously comprises at least one cleaning zone, which is configured for a tooth-cleaning application, in particular in the user's oral cavity. The cleaning zone preferably comprises at least one cleaning unit, in particular at least one brush head, advantageously a toothbrush head, preferably with a plurality of bristles and/or bristle bundles and/or injection-molded cleaning elements and/or injection-molded bristles and/or soft-elastic cleaning elements. The cleaning region is in particular realized on the application unit. The application unit may be attached directly to a handle unit if the handle unit, the neck region and the head region form one component, or the application unit may be realized as an exchangeable head. In particular, injection-molded cleaning elements and/or soft-elastic cleaning elements may also be realized on exchangeable heads. However, the cleaning unit may for example also be realized as an interdental brush and/or as a single tuft (e. g. a single large bristle bundle) and/or as an arc on which dental floss is spanned, in particular as a flosser, or the like. Advantageously, the application unit further comprises at least the neck element, which is preferably, in particular directly and/or integrally, connected to the cleaning region. “Integrally” is in particular to mean connected by material bond, for example by a welding process, an adhesive process, an injection-molding process and/or another process deemed expedient by someone skilled in the art, and/or advantageously formed in one piece, such as for example by production from a casting and/or by production in a single-component or multi-component injection-molding procedure, and advantageously from a single blank.

[0023]“Configured” is in particular to mean specially designed and/or equipped. By an object being configured for a specific function is in particular to be understood that the object fulfils and/or performs this specific function in at least one application state and/or operation state.

[0024]The oral hygiene means in particular has a front side and a rear side, which are in particular arranged facing away from each other. Preferably the cleaning region is arranged on the front side of the oral hygiene means. The front side is in particular a side of the oral hygiene means that is visible in a viewing direction perpendicular to the longitudinal axis of the oral hygiene means and perpendicular to the width axis of the oral hygiene means. In particular, the side of the brush on which the thumb is placed is referred to as the front side of the oral hygiene means. The front side is normally also the side to which the bristle field, respectively the cleaning elements, is/are directed. The rear side advantageously corresponds to a side of the oral hygiene means that is visible in a viewing direction opposed to the viewing direction mentioned above. The side of the toothbrush opposite the bristle field is referred to as the rear side of the oral hygiene means. In particular, a side situated to the left in a perpendicular view onto the front side of the oral hygiene means, with the underside oriented in the direction of the viewer, is referred to as the lefthand side of the oral hygiene means. In particular, a side situated to the right in a perpendicular view onto the front side of the oral hygiene means, with the underside oriented in the direction of the viewer, is referred to as the righthand side of the oral hygiene means. In particular, an end of the oral hygiene means on which the cleaning region is arranged is referred to as the upper side. In particular, an end of the oral hygiene means opposite the upper side, which is situated closest to the handle region, is referred to as the underside.

[0025]The handle unit preferably comprises at least one handle element, which is advantageously configured for being held with a hand. The handle element is preferably realized so as to be waisted at least region-wise. This advantageously allows a secure hold and optimizes the ergonomics. Especially preferentially, the handle element is realized in elongate fashion, wherein a longitudinal axis of the handle element advantageously corresponds to the longitudinal axis of the oral hygiene means. The handle element is made at least partially, in particular completely, of at least one hard component. It would also be conceivable that the handle element is additionally made of one or several soft components. Preferably, the material volume body is made at least to a large extent, in particular completely, of at least one hard component. In particular, the handle element advantageously comprises at least one thumb-gripping region and/or at least one handle region. The thumb-gripping region is advantageously arranged on the front side of the oral hygiene means, in particular on a front side of the handle element. It is conceivable that the thumb-gripping region and/or the handle region comprise/s at least one element and/or a surface structuring made of at least one soft component and/or at least one hard component.

[0026]The handle region advantageously comprises at least one handle element. Preferably, a main extension direction of the handle element is arranged at least substantially parallel to the longitudinal axis of the oral hygiene means. The handle element advantageously comprises at least one surface structure element, particularly advantageously a plurality of surface structure elements, which are formed at least substantially identically or at least geometrically similarly to the above-described surface structure elements of the thumb-gripping region. Preferably, the surface structure elements of the handle element are arranged, in particular at least in pairs, in each case grouped one behind the other along the longitudinal axis of the oral hygiene means.

[0033]The materials used may be recyclable materials. For recyclable materials there is advantageously a possibility of recycling after use. Particularly preferably, materials are used which can enter an existing recycling stream, such as polyester (PET), polyethylene (PE), polypropylene (PP).

[0034]The materials used may be recycled materials. Particularly preferably, materials are used which originate from a recycling stream, such as polyester (rPET), polyethylene (rPE), polypropylene (rPP).

[0035]Within the scope of this disclosure, virtually any hard components and soft components are possible, which will be suitably combined and/or selected expediently by someone skilled in the art. Suitable hard components are, for example, styrene polymerisates, such as styrene acrylonitrile (SAN), polystyrene (PS), acrylonitrile butadiene styrene (ABS), styrene methyl methacrylates (SMMA), styrene butadiene (SB) or the like. Furthermore, a hard component may comprise polyolefins, such as polypropylene (PP), polyethylene (PE) or the like, in particular also in the form of high-density polyethylene (HDPE) or low-density polyethylene (LDPE). Moreover, polyesters are suitable, such as for example polyethylene terephthalate (PET), in particular in the form of acid-modified polyethylene terephthalate (PETA), glycol-modified polyethylene terephthalate (PETG), polybutylene terephthalate (PBT), acid-modified polycyclohexylene dimethylene terephthalate (PCT-A), glycol-modified polycyclohexylene dimethylene terephthalate (PCT-G) or the like. Furthermore, a utilization of cellulose derivatives is conceivable, such as for example cellulose acetate (CA), cellulose acetobutyrate (CAB), cellulose propionate (CP), cellulose acetate phthalate (CAP), cellulose butyrate (CB) or the like. Furthermore, a hard component may comprise for example polyamides (PA), such as PA 6.6, PA 6.10, PA 6.12 or the like, polymethyl methacrylate (PMMA), polycarbonate (PC), polyoxymethylene (POM), polyvinyl chloride (PVC), polyurethane (PUR), polyamide (PA) or the like. In particular, polyethylene (PE) and/or polyurethane (PU) may be used as hard component and/or as soft component. In particular, a hard component has a modulus of elasticity of at least 1,000 N/mm² and advantageously of at least 1,300 N/mm² and/or of at most 2,400 N/mm² and advantageously of at most 1,800 N/mm². Preferentially polypropylene (PP) is used as a hard component. At least certain materials mentioned as a hard component may be sustainable materials. In particular, materials with a cellulose content are at least partially bio-based.

[0036]Advantageously, hard components are used for stable and/or structure-bearing elements, in particular in the handle element and/or in a carrier element of the application unit and/or of the fastening unit or the like. Preferably, the oral hygiene means, or at least a base body of the oral hygiene means, has a single hard component, which may be made of one of the materials mentioned or also of a mixture of the materials mentioned. However, combinations of different hard components are also conceivable, wherein these may, for example, be processed in a two-component and/or multi-component injection molding and/or may be glued and/or welded, in particular ultrasonically welded, with one another. Alternatively or additionally, several hard components may be used, which do not enter into a material bond in a two-component and/or multi-component injection molding. It is in particular conceivable that in such a case a form fitting connection, realized for example as at least one undercut and/or at least one breakthrough and/or at least one at least partial injection molding or the like, is created between hard components. It is herein conceivable that, for example, a second hard component, which is in particular injection-molded onto a first hard component, dwindles and/or shrinks after an injection molding and advantageously forms a shrinkage connection. Suitable combinations may, for example, be polypropylene-polyester, polypropylene-sustainable material, polypropylene-styrene-acrylonitrile or other combinations. In such a combination, polypropylene serves to create a material bond with the soft component.

[0037]Suitable soft components are, for example, thermoplastic styrene elastomer (TPE-S), such as for instance a styrene-ethylene-butylene-styrene copolymer (SEBS), a styrene-butadiene-styrene copolymer (SBS) or the like. Moreover, a utilization of thermoplastic polyurethane elastomer (TPE-U), thermoplastic polyamide elastomers (TPE-A), thermoplastic polyolefin elastomers (TPE-O), thermoplastic polyester elastomers (TPE-E) or the like is conceivable. Beyond this, a soft component may comprise, for example, at least one silicone. A soft component advantageously has a Shore A hardness of at most 90, advantageously of at most 50 and particularly advantageously of at most 30. Preferably, at least one soft component forms at least one material bond with at least one hard component, in particular in at least one two-component and/or multi-component injection molding, advantageously at least by an overmolding and/or molding-around. The materials mentioned as a soft component may be at least partially sustainable materials. The soft component may be a material mixture of sustainable material and non-sustainable soft component. For example, the soft component may be a mixture of recycled polypropylene (rPP) and a soft component. Recycled polypropylene (rPP) may be a raw material for producing a soft component. The weight percentage of recycled polypropylene in the soft component is more than 10%, preferably more than 20%, particularly preferably more than 30%.

[0038]It is advantageously conceivable that a hard component used and a soft component used have different colors, such that surface structures, inscriptions, motifs and the like may be realized by means of a suitable design of base body and soft element.

[0039]It is furthermore proposed that the at least one application unit comprises a brush head, in particular a toothbrush head. The application unit advantageously comprises at least one cleaning unit, in particular a toothbrush head, with bristles. The cleaning unit advantageously also comprises at least one bristle carrier, for example a brush head base body. Advantageously, at least some or all of the bristles are customary extruded bristles.

[0040]Bristles may herein in particular comprise at least one hard component and/or at least one soft component. Preferably, the bristles are made at least partially or completely of polyamide (PA) and/or of polyester (PBT, PET), wherein any other materials (hard component or soft component) are conceivable and sustainable materials, for example chitosan, are also possible. Furthermore, the bristles may be produced from a degradable material. It is also conceivable that at least some of the bristles have a tapering and/or a variable cross section. Preferably, the bristles are made of a single, in particular mixed, material. However, bristles made of a plurality of components and/or materials are also conceivable, which may in particular be producible and/or produced by means of at least one co-extrusion. The bristles may, for example, be producible and/or produced by extrusion, cutting to length and/or post-processing. In contrast to injection-molded bristles or to rubber-elastic massaging and cleaning elements produced by means of injection molding, customary bristles are extruded, cut, processed and inserted and/or anchored at the toothbrush handle by an adapted method, for example the anchor punching method, the AFT method, the PTt method and/or the IMT method.

[0041]In particular, cylindrical or tapered bristles are possible, wherein any cross sections, for example polygonal, triangular, rectangular, square, elliptical, star-shaped, trapezoidal, parallelogram-shaped, rhombus-shaped or any other cross sections are conceivable. In particular, in a bristle bundle different bristles but also different bristle bundles, in particular in each case with a specific type of bristles, may be used. Bristles and/or bristle bundles may herein be arranged in a regular but also in an irregular manner. In particular, bristles and/or bristle bundles, which are arranged in groups and/or neighboring one another, may—in particular alternately-differ with regard to at least one characteristic, for example a length, a diameter, a material, a color, a material hardness, a geometry, a tapering and the like. Preferably the bristles have a diameter, in particular perpendicular to their longitudinal axis, of at least 0.075 mm and/or of at most 0.25 mm. Advantageously the bristles have a cross-section area, in particular perpendicular to their longitudinal axis, of at least 0.002 mm² and/or of at most 0.2 mm². In the case of bristles used in the cosmetics sector, for example bristles of an additional application element, thinner bristles and/or bristles with a smaller cross section may be used, in particular bristles with a diameter, in particular perpendicular to their longitudinal axis, of at least 0.025 mm and/or of at most 0.2 mm and/or with a cross-section area, in particular perpendicular to their longitudinal axis, of at least 0.001 mm² and/or of at most 0.15 mm². In the case of tapered bristles, in particular polyester (PBT, PET, or PTT) is suitable as a material, wherein sustainable materials are also possible, wherein a tapering may be produced mechanically and/or chemically. However, other materials are likewise conceivable. Preferably the bristles are straight in the longitudinal direction; however, undulated and/or twisted and/or helical and/or rotated bristles, and in particular combinations of different bristles, are also conceivable. Furthermore, bristles having a smooth surface are conceivable, as are bristles having a textured surface.

[0042]Furthermore, the bristles, in particular in the form of bristle bundles, are processed, in particular fastened to the bristle carrier, preferably by means of at least one anchor punching method, an anchor-free tufting method (AFT), an in-mold tufting method (IMT), a PTt method or the like. The bristle carrier preferably comprises a plurality of, in particular drilled and/or injection-molded, bristle receptacles, in particular holes for bristle bundles. In the case of anchor punching, it is for example conceivable that first a base body, preferably of the brush head, which is in particular made of a hard component, is produced by injection molding, wherein advantageously blind holes for bristle bundles are formed during the injection molding. Of course, however, subsequent drilling of blind holes is also conceivable. Preferably bristles or bristle bundles are then folded and are fastened, in particular by means of punching, by means of at least one anchor in respectively one blind hole. Loop punching is likewise conceivable.

[0043]Alternatively, as has been mentioned, anchor-free methods are also conceivable, wherein advantageously bristles and/or bristle bundles are not folded. In this case, compared to anchor punching, bristles and/or bristle bundles have approximately half the length. For example, it is herein conceivable that the bristle bundles are first singulated, are melted with one another and/or their bristle ends are in particular subsequently overmolded for fastening. Herein bristle bundles may be brought together. Herein a production by means of the in-mold tufting method is possible, wherein advantageously a base body, for example of the brush head and/or of the handle unit and/or of the fastening unit, is formed during the overmolding of the bristle ends. It is likewise conceivable that, in particular within the scope of an integrated-anchorless production, bristles are first overmolded with platelets or the like and these platelets are then in turn overmolded, for example in order to form the brush head and/or the handle unit.

[0044]It is also conceivable that the application unit is composed of a base body and a bristle platelet, which is furnished with bristles and/or alternative cleaning elements. For this purpose, firstly bristle platelets with through holes are manufactured by injection molding, through which through holes subsequently bristles are guided. Preferably the bristles are then connected, in particular melted, preferably with one another and/or with the respective bristle platelet, on a rear side. In this way bristle platelets with bristles can then be welded and/or glued, preferably by ultrasonic welding, with a base body, in particular a brush head. For this purpose the base body, in particular the brush head, in particular has a recess into which the bristle platelet can be inserted. In this context the anchor-free tufting method is to be mentioned as a known manufacturing method, which in particular enables bristle bundles to be brought together. In particular, a side of the bristle platelet which is placed into a recess of the base body and points toward the rear side of the oral hygiene means is referred to as the underside of the bristle platelet. Correspondingly, the upper side of the bristle platelet points towards the front side of the oral hygiene means.

[0045]Manufacturing, in particular injection molding, of a brush head with through holes for bristles is a possible further method for an anchor-free furnishing with bristles. Bristles can then be guided through the through holes and be melted on a rear side, in particular melted with one another and/or with the brush head. Preferably after this an overmolding, in particular with at least one soft component, of the melted regions and/or of the brush head is carried out.

[0046]It is further conceivable to first manufacture a brush head with blind holes, for example by injection molding and/or by drilling the blind holes. In that case, bristles are in particular put together to form bundles and are melted with one another at one end, and/or they are connected in another way. The brush head is then heated, in particular to a glass transition temperature of its material. Then bristle bundles can advantageously be introduced into the blind holes and can be anchored at the brush head by pressing. In particular, herein the heated blind holes and/or their surroundings are deformed, such that the bristle bundles are anchored therein.

[0047]Alternatively or additionally to punched and/or welded-on and/or glued-on bristles, injection-molded bristles are also conceivable. These may be manufactured together with the application unit, the handle unit and/or the fastening unit, In particular during a multi-component injection molding, or they can be subsequently injection-molded onto a base body of the application unit.

[0048]Twisting-in is a further possible method for furnishing the brush head with bristles. Herein, for example, filament is supplied from a roll, wherein in particular several filament strands have been wound on a roll. For machine loading, in each case several rolls are pre-tensioned, since each filament in the brush corresponds to one filament strand. The filaments are spread out in width correctly such that they have the width in which they are introduced into the brush. The filaments are advanced such that they are then free for the next step, i. e. that a wire can be guided over the filaments. After this a wire is supplied from a roll onto the machine, i. e. the wire is wound off and is introduced into the process.

[0049]The wire is cut to a length greater than the wound-off length of the twisted-in brush, the final cutting to length takes place after the twisting in. The wire is bent to form a U such that the open side can then be pushed over the filaments for a threading-in of the bristles. The wire is held at the bottom of the U. Following this, the open wire end is clamped such that the filaments are held between the wire pieces. The filaments are cut to a length greater than the final length in the brush, such that the brush can be cut correctly subsequently when the filaments have been twisted in. The wire is rotated in such a way that the filaments are clamped between the wire and are thus fixed. When the filaments have been fixed in the wire, they are cut to the correct length and profiled. When the brush portion has been completed, excess wire is cut off.

[0050]Preferably, in an injection molding process, in particular a two-component and/or multi-component injection molding, materials of injection-molded bristles do not enter into a material bond with other soft components and/or hard components and/or sustainable materials of the oral hygiene means. Preferentially, injection-molded bristles are connected by a form fitting connection, for example by at least one undercut and/or by at least one breakthrough and/or by at least one at least partial overmolding with soft components and/or hard components, wherein in particular a dwindle connection and/or a shrink connection are/is conceivable. However, a connection by at least one material bond is also conceivable.

[0051]In principle, a one-component, two-component and/or multi-component injection molding is conceivable for all possible injection molding processes mentioned. As has been mentioned, materials used, in particular different soft components and/or hard components, may herein be connected by material bond and/or by a form fitting connection. An implementation of articulated and/or mobile or flexible connections by suitable injection molding steps is also conceivable. In principle, for example hot-channel methods, cold-channel methods and/or co-injection methods are possible.

[0052]Alternatively or additionally to a brush head furnished with bristles, the application unit may also comprise at least one tongue cleaner and/or at least one alternative cleaning and/or massaging element. These may in each case be made of a soft component, of a hard component or of a combination of soft and hard components and/or may advantageously be producible and/or produced by injection molding.

[0053]Preferably, injection-molded bristles are made at least partially and advantageously completely of a thermoplastic polyurethane elastomer (TPE-U). Herein a utilization of a modified polyurethane elastomer (TPE-U) is conceivable, which may in particular be modified with regard to improved flow characteristics and/or quick solidification, in particular quick crystallization, advantageously already at higher temperatures. However, other materials are of course also conceivable, for example thermoplastic polyester elastomers (TPE-E), thermoplastic polyamide elastomers (TPE-A), polyethylene (PE), for example in the form of low-density polyethylene (LDPE) or linear low-density polyethylene (LLDPE), or the like. Materials for injection-molded bristles advantageously have a Shore D hardness of at least 0 and particularly advantageously of at least 30, and/or of at most 100 and advantageously of at most 80. In particular, a Shore hardness of a material of injection-molded bristles is advantageously greater than a Shore hardness of the remaining soft components used, for example, for handle elements, massaging elements, further cleaning elements or the like. The materials used for the production of injection-molded bristles may be sustainable materials.

[0054]Furthermore, in principle a utilization of water-soluble polymers is conceivable, for example for hard components, soft components, injection-molded bristles or other elements of the oral hygiene means.

[0055]Likewise, bioplastics, which may in particular be obtained from renewable raw materials, may be used for the hard component, the soft component and/or for the material of injection-molded and/or customary extruded bristles. Sustainable plastics and in particular bioplastics may be biodegradable, in particular compostable, and/or may be made of a recycled and/or recyclable material. Preferably, the material is in particular realized as a plastic. Preferably, the biodegradable, in particular compostable, and/or recycled and/or recyclable material is realized as a bioplastic, in particular made of a plastic based on renewable raw materials and/or of a biodegradable plastic. It is in particular also possible that the material is fossil-based and biodegradable, such as for example PVOH, PCL, PBAT, PET or PBS, that the material is based on renewable raw materials and biodegradable, such as for example PLA, PHA, cellophanes or starch blends, or that the material is based on renewable raw materials and is not biodegradable, such as for example Ca, Bio-PE, Bio-PP, Bio-PA, Bio-PET. Various bioplastics, deemed expedient by someone skilled in the art, are conceivable, such as for example starch-based bioplastics, cellulose-based bioplastics, polyhydroxyalkanoates, such as in particular polyhydroxybutyric acid (PHB), polylactic acid (PLA), aliphatic and/or aromatic copolyesters, or further bioplastics, for example lignin-based bioplastics. Preferentially the application unit and/or the handle unit may be made to a large extent of a biodegradable, in particular compostable, material and/or of a recycled material. Preferably, the oral hygiene means is made of only one component. In particular, the oral hygiene means comprises a hard component. The material volume body of the application unit and/or of the handle unit may be made at least to a large extent of the hard component. The hard component and/or the soft component and/or the material for injection-molded bristles in particular consists of a bioplastic, which may in particular be obtained at least partially from renewable raw materials. Herein suitable raw materials are in particular corn, hemp, sugar, castor oil, palm oil, potatoes, wheat, sugar cane, caoutchouc, wood, the castor plant and the like. Respective possible base materials could be, for example, cellulose, starch, lactic acid (PLA), glucose, chitin, chitosan or the like, from which in particular respective bioplastics may be synthesized.

[0056]A “material volume body” is in particular to mean, in this context, a body which forms the handle unit, and which in particular consists of a solid material. Preferably, the volume body forms a supporting structure of the handle unit. Preferably, the material volume body is made to a large extent of one or several hard component/s, and optionally additionally of one or several soft component/s.

[0057]A “coupling unit” is in particular to mean, in this context, a unit which forms an interface for a coupling of the application unit with the handle unit, said coupling being manually releasable, in particular without tools. The coupling unit in particular enables multiple coupling and uncoupling of the application unit with the handle unit, which is carried out by an operator. The coupling unit in particular serves for replacing the application unit on the handle unit. Herein a coupling may be carried out, for example, by means of a plug-in movement, by a rotary movement and/or by a combination of a plug-in movement and a rotary movement. Preferably the coupling unit comprises at least one first coupling element and at least one second coupling element that corresponds to the first coupling element. Preferably, a first coupling element forms an interface projection while the second coupling element forms an interface receptacle. An “interface receptacle” is in particular to mean, in this context, a receiving region configured for a loss-proof accommodation of an interface projection. Preferably, the interface receptacle is in particular configured for a force-fitting and/or form-fitting accommodation of the interface projection. The interface receptacle in particular forms a receiving region into which the interface projection can be inserted, in particular plugged, wherein the interface projection in particular latches and/or jams in the receiving region starting from a defined insertion force and/or a defined insertion path. The interface receptacle is preferably arranged on a side of the application unit that faces away from the brush head.

[0058]A connection of the application unit and the handle unit may be brought about, for example, by a screwing and/or a screw connection, with a thread being introduced in the application unit and in the handle unit. The parts could therefore in particular be screwed together, wherein the threads must in particular be adapted to a handle configuration, such that the plug-on part will eventually be in the correct orientation with respect to the handle. The application unit is preferably screwed onto the handle unit with a clockwise rotation. Alternatively, a plug-and-snap connection would be conceivable for the coupling unit. A first coupling element may, for example, be inserted into the second coupling element along the longitudinal axis and may eventually be snapped for securing purposes.

[0059]The snapping may take place, for example, with a pin-and-recess geometry. Alternatively, a bayonet connection would be conceivable for the coupling unit. A connection could thus in particular be brought about by inserting and rotating or by rotating and snapping. Alternatively, a press-fit connection would be conceivable for the coupling unit. In particular, a frictional connection could be provided, wherein one coupling element forms a recess and one coupling element forms a pin.

[0060]The coupling unit is in particular designed in such a way that the fit between the plug-on brush and the handle can be adjusted in a simple manner. Thus, in particular, different materials can be used for the handle. Thus, in particular, differences are possible in the case of implementations in plastic compared with an implementation in metal, wherein preferably the interface is nevertheless constructed in the same manner.

[0061]Preferably, the coupling unit is configured to form a plug-and-snap connection. Preferably, the first coupling element is realized as an interface projection and is configured to be plugged into the second coupling element and to latch in an end position in the second coupling element, which is realized as an interface receptacle. The latching is preferably perceived by the user haptically and/or acoustically. An “orientation groove” is in particular to mean, in this context, a groove in the first coupling element, said groove being configured, when the application unit is plugged onto the handle unit, for an orientation of the second coupling element, at least in a limited angle range, relative to the first coupling element. Preferably, the guide ridge can be introduced into the orientation groove in different rotational positions around a longitudinal axis of the oral hygiene means, in particular over an angle range of at least 30°, preferably at least 90° and especially preferentially at least 120°, wherein with increasing engagement or with proceeding coupling of the first coupling element in the second coupling element, the second coupling element is also oriented into a final angle position by means of “forced” rotation.

[0062]Preferably, the orientation groove extends parallel to the main extension direction of the handle unit over the entire first coupling element. Preferably, the orientation groove in particular has a substantially constant cross section along the main extension direction of the handle unit. The orientation groove in particular has a trapezoidal, at least approximately rectangular cross section, wherein a bottom side of the groove is rounded.

[0063]Furthermore, a “guide ridge” is in particular to mean, in this context, an element, preferably a web, which is configured for guiding the first coupling element relative to the second coupling element during a coupling operation. Preferably, the guide ridge is further configured, inter alia, to provide an anti-twist protection of the second coupling element relative to the first coupling element in a coupled state. The guide ridge moreover serves for reinforcing the application unit in the receiving region which is otherwise realized with thin walls. Preferably, the guide ridge in particular projects-perpendicularly to a middle axis of the second coupling element-Into a receiving region of the second coupling element for the first coupling element. Preferably, the guide ridge in particular forms a wall which is on one side connected to a base body of the second coupling element and extends in a plane extending through the center axis of the second coupling element.

[0064]“Configured” is in particular to mean specially programmed, designed and/or equipped. By an object being configured for a specific function is in particular to be understood that the object fulfils and/or performs this specific function in at least one application state and/or operation state.

[0065]The handle unit is in particular usable multiple times, i.e. not a disposable product. In particular, only the application unit is exchanged. In particular, application units with different properties may also be combined with the same handle unit. Thus, in particular, several different attachments, which can be exchanged back and forth, are conceivable on the same handle unit. The oral hygiene product is in particular available for sale as a kit, for example with a holder/stand for storing the application unit and the handle unit, with the handle unit and with different application units, for example a plug-on brush, an interdental plug-on part and/or a tongue cleaner plug-on part.

[0066]It is furthermore proposed that the orientation groove extends over an entire extent of the first coupling element. Preferably the orientation groove extends over an entire main extent of the first coupling element. Preferably the orientation groove extends along the longitudinal axis of the oral hygiene means over an entire extent of the first coupling element. Preferably the orientation groove in particular runs in a straight line. Preferably a bottom of the orientation groove extends at least approximately parallel to a main extension direction of the first coupling element. Preferably an angle between the bottom of the orientation groove and the longitudinal axis is 1° to 10°, preferably 1° to 5°. In particular, a depth of the orientation groove increases from a free end towards the handle unit. A “main extent” of an object is in particular to mean, in this context, an extent of a longest edge of a smallest imaginary cuboid just still completely enclosing the object. The orientation groove is arranged with a center axis in particular offset from the longitudinal axis of the oral hygiene means. Furthermore, the orientation groove is substantially U-shaped in cross section with slightly angled sides, and is in particular open towards the rear and towards the top. The length of the orientation groove, measured at the bottom of the groove, is 10 mm to 30 mm, preferably 15 mm to 25 mm. The width of the orientation groove at the free, respectively open, end is 1.5 mm to 5 mm, preferably 2 mm to 3.5 mm, wherein in particular demolding and/or insertion slopes are provided in the longitudinal direction. At an end facing towards the handle unit, the orientation groove in particular has at the bottom a width of 1.5 mm to 5 mm, preferably of 2 mm to 2.5 mm, and at the top in particular has a width of 2 mm to 6 mm, preferably 2.5 mm to 3 mm. Furthermore, the orientation groove in particular has at its free end a depth of 1 mm to 6 mm, preferably of 2 mm to 4 mm, and in particular has at the end facing towards the handle unit a depth of 2 mm to 8 mm, preferably 3 mm to 5 mm. The orientation groove in particular has a rounded, preferably C-shaped cross section. Towards a free end, towards the application unit, the orientation groove is open. Towards the handle unit, the orientation groove is closed and merges into the handle unit and may thus form a stop for the guide ridge. With the orientation groove, in particular an advantageously reliable orientation of the second coupling element relative to the first coupling element is achievable. It is further possible to provide an advantageously long orientation groove. This in particular allows providing, over a long distance, a guidance and thus a pleasant orientation of the second coupling element.

[0067]Beyond this, it is proposed that the first coupling element has a base body which delimits the orientation groove and has a conical basic shape, wherein a center axis of the base body is angled with respect to a longitudinal axis of the handle unit. Preferably, the cone is constructed so as to be straight in itself, wherein the rear side, and thus the outer cone surface, of the base body is interrupted by the orientation groove. The angle of the outer cone surfaces of the base body with respect to the longitudinal axis of the base body is in particular 4° to 15°, preferably 5.5° to 9°, the outer cone surfaces in particular being symmetrical. The length of the base body measured on the surface, in particular on the side, and measured from the free end to a transition edge to the handle unit, is 8 mm to 30 mm, preferably 15 mm to 25 mm. Furthermore, the length of the base body measured on the surface, in particular on the front side, and measured from the free end to a transition edge to the handle unit, is 15 mm to 35 mm, preferably 22 mm to 32 mm. The length of the base body measured on the surface, in particular on the rear side, and measured from the free end to a transition edge to the handle unit, is 10 mm to 30 mm, preferably 17 mm to 27 mm. The width of the base body, measured from side to side, at the highest point of a transition geometry from the handle unit to the base body, and perpendicular to the plug-on direction, is 5 mm to 15 mm, preferably 7 mm to 11 mm. Furthermore, the width of the base body, measured from side to side at the free end and perpendicular to the longitudinal axis, is 2 mm to 10 mm, preferably 4 mm to 6 mm. An end face of the base body at a free end in particular extends partly substantially perpendicularly to the longitudinal axis of the oral hygiene means. Moreover, one side of the end face preferably has a rounding, while a second side forms a surface sloping at an angle for a demolding. The angle of the second side with respect to a line that is perpendicular to the longitudinal axis is in particular 8° to 20°, preferably 10° to 15°. Furthermore, a cone axis of the base body, an extent of the orientation groove and a plug-on direction are preferably parallel. The bottom of the orientation groove in particular runs parallel to a longitudinal axis of the base body. The walls of the orientation groove are angled by an angle of 1° to 10°, preferably 1° to 5°, with respect to a main extension direction. The longitudinal axis of the base body is angled with respect to a longitudinal axis of the handle unit. As a result, in particular advantageously reliable plugging of the second coupling element onto the first coupling element is achievable.

[0068]It is further proposed that the first coupling element may comprise a first latching means, in particular a latching element, which is arranged in the orientation groove. The first latching means is in particular realized as a latching projection. The first latching means is in particular arranged in an end region of the orientation groove that faces towards the handle unit. Preferably the first latching means is in particular arranged on a bottom of the orientation groove. A “latching element” is in particular to mean, in this context, an element for producing a latching connection during assembly. The latching element in particular forms part of a latching unit, wherein the latching unit in particular consists of at least two latching means, in particular a latching element and a latching recess. Herein a “latching unit” is in particular to mean a unit comprising at least one latching element and a latching recess, wherein during a fastening process at least one of the latching means is elastically deflected in order to then latch behind and/or with a corresponding latching means by way of an internal tensile force. Latching elements are preferably perceived haptically and/or acoustically. The first latching means is in particular realized as a trapezoidal elevation in the orientation groove. The first latching means in particular has a trapezoidal cross section in a plane parallel to the longitudinal axis of the first coupling element. Preferably the first latching means has a height of 0.2 mm to 1.2 mm, preferably of 0.4 mm to 0.8 mm. Furthermore, the first latching means in particular extends over an entire width of the orientation groove. Furthermore, the first latching means in particular has at the top, on a plateau of the trapezoidal cross section, a length of 0.2 mm to 1 mm, preferably of 0.3 mm to 0.7 mm. Furthermore, the first latching means in particular has at the bottom, where it starts, a length of 1 mm to 5 mm, preferably of 2 mm to 3 mm. An angle of the legs of the trapezoidal cross section is in particular 10° to 60°, preferably 20° to 40° (measured between the plateau and the side surfaces). Preferably a distance between the first latching means and the free end of the first coupling element, measured along the longitudinal axis from a center of the first latching means, is 7 mm to 40 mm, preferably 15 mm to 25 mm. This in particular allows providing advantageous releasability of the coupling unit. It is moreover in particular possible to provide an advantageous connection between the first coupling element and the second coupling element.

[0069]The first coupling element preferably comprises several latching means. The latching means in particular serve for fixing the application unit to the handle unit. In particular, latching means are provided on a front side and on a rear side. Preferably one latching means is arranged on a front side, on an outer side of the base body of the first coupling element, and one latching means, in particular the first latching means, is arranged on a rear side, in the orientation groove. The latching means are in particular aligned on the longitudinal axis. The latching means are in particular symmetrical at right angles to the longitudinal axis and at right angles to a pulling direction. As a result, respectively one latching unit is formed on the front side and on the rear side.

[0070]It is moreover proposed that the second coupling element may comprise, on a crest of the guide ridge, a second latching means, in particular a latching recess, formed correspondingly to the first latching means. A “crest of the guide ridge” is in particular to mean, in this context, an upper, free-standing edge or an upper, free-standing surface of the guide ridge, facing away from a fastening side of the guide ridge on which the guide ridge is connected to a base body of the second coupling element. The second latching means is preferably arranged in an end region of the second coupling element that faces towards the handle unit. The guide ridge preferably starts directly at an open end of the second coupling element and extends in a receiving region of the second coupling element for accommodating the first coupling element. Preferentially the guide ridge is realized integrally with the remaining portion of the application unit. The guide ridge is moreover in particular arranged symmetrically on the longitudinal middle axis. Preferably the guide ridge has a height of 3 mm to 7 mm, preferably of 4 mm to 6 mm, at an end facing towards the handle unit, and has in the receiving region, at an end facing towards the application unit, a height of 1 mm to 5 mm, preferably of 1.5 mm to 3.5 mm. The guide ridge furthermore in particular has on a crest a width of 1 mm to 3.5 mm, preferably of 1.5 mm to 2.5 mm, wherein the crest is in particular of rounded design. Where it starts at a base body of the second coupling element, the guide ridge in particular has a width of 1 mm to 5 mm, preferably of 1.5 mm to 3.5 mm. In particular, a length of the guide ridge, measured at the upper edge of the crest, is 10 mm to 40 mm, preferably 15 mm to 30 mm. The guide ridge in particular has a triangular cross section in a plane perpendicular to the longitudinal direction. The second latching means is in particular realized as a depression. The depression in particular has a depth of 0.15 mm to 0.55 mm, preferably of 0.25 mm to 0.45 mm. The second latching means furthermore in particular extends over an entire width of the guide ridge. The length of the second latching means that is realized as a depression is in particular in the longitudinal direction 0.2 mm to 1.2 mm, preferably 0.2 mm to 0.8 mm. The side surfaces of the second latching means that is realized as a depression in particular have an angle of 10° to 60°, preferably of 20° to 40°, relative to the crest of the guide ridge. The second latching means is in particular realized correspondingly to the first latching means. This in particular allows providing advantageous releasability of the coupling unit. Moreover, it is in particular possible to provide an advantageous connection between the first coupling element and the second coupling element.

[0071]Preferably the second coupling element is realized from one component. However, it would also be conceivable that a second component is provided, wherein the second component may in particular be configured for additional functions or for a support of functions. For example, a second component could serve for a sealing at the open end of the second coupling element or, for example, for an implementation of flexibility and sealing in the region of the latching means.

[0072]It is also proposed that the second coupling element has a ring-shaped base body encompassing the guide ridge, wherein the guide ridge comprises, between the second latching means and a fastening region of the guide ridge, in which the guide ridge is connected to the base body, in particular where the guide ridge starts, a recess that is configured to enable a deflection of the second latching means towards the fastening region. The recess in the guide ridge provides a certain flexibility for the second latching means, since the depression and/or its edges may deflect somewhat. The base body of the second coupling element in particular forms an outer shell and in particular serves as a counterpart for the tensioning with elevations on the first coupling element. The base body has a conical basic shape. In the region of the second coupling element, the base body in particular has a material thickness, i. e. in particular a thickness of the skin, of 0.5 mm to 3 mm, preferably of 1 mm to 2 mm. The base body has a material thickness that provides a certain elasticity and/or flexibility. This allows achieving better contact with the various interface elements of the first coupling element. In particular, a close fit can be achieved by a slight deformation of the base body. Furthermore, a larger tolerance range can be used in the coupling unit, in particular by using different materials for the handle unit.

[0073]It is moreover proposed that the first coupling element may comprise at least one further latching means, in particular a latching recess, which is arranged on a side of the base body of the first coupling element which is situated opposite the orientation groove. The further latching means, in particular a third latching means, is in particular arranged on a front side of the first coupling element. The latching recess in particular has a trapezoidal cross section. The side walls of the trapezoidal cross section in particular have an angle of 100° to 175°, preferably 130° to 170°, with respect to the bottom. The third latching means is in particular realized symmetrically. The length of the side walls in particular results from the angles and from the intersection with the cone surface of the base body of the first coupling element. The third latching means, which is realized as a depression, in particular has a depth of 0.5 mm to 2 mm, preferably of 1 mm to 1.7 mm. In terms of width, the third latching means in particular extends over the entire cone from left to right. In particular, there is no lateral boundary; there is a tapering. A length of the third latching means in the longitudinal axis direction, at the top, at the opening of the depression, is 3 mm to 8 mm, preferably 4.5 mm to 6.5 mm. At the bottom, the length in particular is 0.2 mm to 2 mm, preferably 0.5 mm to 1.2 mm. This in particular allows providing advantageous releasability of the coupling unit. Moreover, it is in particular possible to provide an advantageous connection between the first coupling element and the second coupling element. In particular, fixing on both sides is achievable.

[0074]Preferably the second coupling element comprises a fourth latching means, which may be realized as a latching projection and is realized correspondingly to the third latching means. Preferentially the second coupling element comprises two latching means, in particular the fourth latching means on the front side, which is realized as a latching projection, in particular a latching cam, and the second latching means, which is realized as a depression, on the rear side of the second coupling element on the guide ridge. The fourth latching means in particular has a trapezoidal cross section. In particular, the fourth latching means laterally has a direct transition to the base body, such that no ledge is formed. The maximum height of the fourth latching means relative to the surrounding geometry is in particular 0.2 mm to 1.3 mm, preferably 0.4 mm to 1 mm. The width of the fourth latching means essentially corresponds to a width of the receiving region of the second coupling element. The fourth latching means in particular extends over an entire width of the receiving region of the second coupling element. Furthermore, the length of the fourth latching means in the longitudinal direction is at the top, on an elevation of the trapezoidal cross section, 1.5 mm to 6 mm, preferably 2.5 mm to 4.5 mm. The angle of the legs of the trapezoidal cross section of the fourth latching means, measured from the base body, is 10° to 60°, preferably 20° to 40°.

[0075]It is further proposed that the further latching means, in particular the third latching means, of the first coupling element is arranged in a first end region of the first coupling element, which faces towards the handle unit. A distance between the third latching means and a free end of the first coupling element, measured along the longitudinal axis from a center of the third latching means, is 10 mm to 50 mm, preferably 15 mm to 30 mm. A distance between the first latching means and the third latching means, measured along the longitudinal axis, in particular from a center of the first latching means to a center of the third latching means, is 2 mm to 10 mm, preferably 3 mm to 6 mm. This in particular allows providing an advantageous first coupling element.

[0076]It is also proposed that the further latching means of the first coupling element is substantially larger than the first latching means of the first coupling element. Furthermore, the fourth latching means of the second coupling element is preferably realized substantially larger than a second latching means of the second coupling element. This in particular allows generating an advantageously strong holding force on a front side.

[0077]Corresponding first and second latching means as well as third and fourth latching means may be realized in pairs individually or in combination. This means that only a first and a second latching means may be realized; only a third and a fourth latching means may be realized; or first and second as well as third and fourth latching means may be realized. In this way it is possible that the most favorable latching means construction is selected, depending on a utilization. The selection of the latching means depends inter alia on the selection of materials as well as on the forces, which in turn depend on the utilization in the intended use. If the base body of the application unit is realized so as to be rather soft, several latching means may be necessary for achieving the required stability in the utilization. Each of the two combinations of corresponding latching means (first and second as well as third and fourth) may also ensure all required functions on its own, depending on the selection of materials.

[0078]The latching means are designed in such a way that if several corresponding latching means are used, these are realized such that they are synchronous with the snapping and the associated acoustics. This means that the actual latching, for example, occurs, simultaneously for first and second latching means as well as for third and fourth latching means, with the acoustic clicking also occurring synchronously during the latching. Thus, for example, only one clicking will be heard during the latching, and the actual latching will occur only with a haptic perception.

[0079]It is furthermore proposed that the first coupling element has a base body which delimits the orientation groove and has at least two supporting projections, which are arranged on an outer side of the base body and are configured, in a coupled state of the coupling unit, to bear against an inner side of a base body of the second coupling element. The supporting projections in particular have a shape that follows the cone of the base body.

[0080]The supporting projections are in particular of essentially trapezoidal design, wherein a widest region points downwards. The shapes of the supporting projections are in particular adapted to a demolding. The edges of the supporting projections are rounded. The supporting projections are connected to the base body of the first coupling element via rounded edges. The supporting projections in particular have a height of 0.1 mm to 0.5 mm, preferably of 0.1 mm to 0.3 mm. However, preferably different heights of the supporting projections are possible, in each case adapted to the interaction between the application unit and the handle unit. The heights of the supporting projections are in particular intended to compensate play, i. e. tolerances. Preferably, the supporting projections are configured for a compensation of tolerances. This is attained in particular in an interaction with the somewhat laterally resilient base body, which is favored by the orientation groove. Height profiles of the supporting projections are also possible lengthwise or transversely in the individual supporting projections. The width of the supporting projections transversely to the longitudinal axis is in particular at most 1.5 mm to 4 mm, preferably 2 mm to 3 mm, and at least 0.5 mm to 3 mm, preferably 1 mm to 2 mm. A length of the supporting projections along the longitudinal axis is in particular 1 mm to 7 mm, preferably 1.5 mm to 6 mm. Preferably, the length of the supporting projections is depends at least partly on a position of the respective supporting projection. The supporting projections are in particular arranged, offset in the longitudinal axis direction and around the base body, in several positions and on different sides. Preferably, in particular rings or bands of supporting projections are provided, in which the supporting projections are in each case arranged in a peripheral region around the base body. Preferably the supporting projections are arranged symmetrically to the longitudinal axis. In particular, the supporting projections enable a support of the second coupling element over small surfaces and not over a large surface. This in particular provides advantageous adjustability of the fit, and improved tolerance compensation is enabled.

[0081]It is further proposed that the first coupling element comprises a plurality of, in particular at least four, primary supporting projections that are arranged in a band in a first end region of the first coupling element, which faces towards the handle unit. The primary supporting projections are arranged in the band partly offset with respect to one another along the longitudinal axis, wherein the primary supporting projections are in particular arranged in such a way that they overlap along the longitudinal axis. Measured along the longitudinal axis, an upper edge of the band is spaced apart from the free end of the interface by 6 mm to 21 mm, preferably by 11 mm to 16 mm. Preferably, the orientation groove extends through the band of primary supporting projections on the rear side. Measured along the longitudinal axis, the width of the band in the longitudinal direction is 3 mm to 12 mm, preferably 5 mm to 8 mm. Measured along the longitudinal axis, the minimum distance from the band to the end face is in particular 0.5 mm to 5 mm, preferably 1 mm to 3 mm. The minimum distance from the band to the end face is in each case realized laterally. Preferably, a number of the primary supporting projections in said band is four to ten, preferably five to seven. In particular, an uneven number of supporting projections in the band is also possible, since one element on the front side may be arranged on the axis of symmetry and/or the longitudinal axis. However, such an implementation is not preferred. In particular, different shapes and/or lengths of the supporting projections are arranged in the band. The supporting projections within the band are preferably arranged symmetrically to the longitudinal axis. Preferably, two primary supporting projections are provided on the rear side at the orientation groove. The two primary supporting projections on the rear side are in particular realized as long supporting projections. In the case of these supporting projections, in particular one side bears against the groove edge of the orientation groove. The two primary supporting projections on the rear side have a length of 3 mm to 8 mm, preferably 4 mm to 6 mm, and a width of 0.5 mm to 3.5 mm, preferably 1 mm to 2.5 mm. Furthermore, long primary supporting projections, in particular two long primary supporting projections, are provided on the front side, which are in each case arranged at a position in the band to the left and to the right of the center. The long primary supporting projections on the front side have a length of 1.5 mm to 6 mm, preferably 2.5 mm to 4 mm, and a maximum width of 1 mm to 5 mm, preferably 1.5 mm to 3 mm. Furthermore, short primary supporting projections, in particular two short primary supporting projections, are preferably provided, which are arranged laterally. The short primary supporting projections preferably have a length of 1 mm to 5 mm, preferably 1.5 mm to 3 mm, and a maximum width of 0.7 mm to 4 mm, preferably 1.2 mm to 2.5 mm. In particular, a support of the second coupling element over small surfaces is achievable by means of the supporting projections. In particular, an advantageously uniform and advantageously circumferentially distributed support is achievable by means of the band.

[0082]It is furthermore proposed that the first coupling element may comprise a plurality of secondary supporting projections, in particular at least three secondary supporting projections, which are arranged in a band in a second end region of the first coupling element, which faces away from the handle unit. The band of secondary supporting projections is in particular arranged at the very end of the base body directly at the edge. An edge of the secondary supporting projections forms the terminal edge or a portion of the terminal edge of the base body. Preferably, the orientation groove extends through the band of secondary supporting projections. The width and/or the height of the band of secondary supporting projections in particular corresponds to the maximum length of the supporting projections. Preferably, the lower edges of the supporting projections form a continuous geometry and are situated on the same plane of the base body. The secondary supporting projections in particular have a length of 1 mm to 6 mm, preferably 2 mm to 4 mm. The number of secondary supporting projections in this band is in particular one to six, preferably two to four. In particular, an uneven number of supporting projections in the band is also possible, since on the front side one element may be arranged on the symmetry axis and/or the longitudinal axis. Preferably, one secondary supporting projection is arranged on the longitudinal axis and two secondary supporting projections are laterally arranged symmetrically directly at the edge of the base body and directly at an edge of the orientation groove. Preferably, an upper terminal edge of the base body forms two sides of the base area of the supporting projections. In particular, a support of the second coupling element over small surfaces is achievable by means of the supporting projections. In particular, an advantageously uniform and advantageously circumferentially distributed support is achievable by means of the band.

[0083]It is further proposed that in a middle region, which is arranged between the first end region and the second end region, the first coupling element is free of supporting projections. Measured between the terminal edges of the bands on the cone surface, in particular measured along the longitudinal axis, a distance between the bands, in particular between the band of primary supporting projections and the band of secondary supporting projections, is in particular 5 mm to 15 mm, preferably 8 mm to 12 mm.

[0084]Preferably, no further supporting element is arranged between the bands. Preferentially the first coupling element may be divided along the longitudinal axis into three regions of equal size, specifically a first end region, a second end region and a middle region, the middle region being arranged between the two end regions. Preferably the second end region is arranged at a free end of the first coupling element. In particular, an advantageously uniform and advantageously circumferentially distributed support is achievable by means of the arrangement of the bands. In particular, a support may be brought about in highly stressed regions.

[0085]It is further proposed that the supporting projections have an at least approximately rectangular or trapezoidal basic shape. The supporting projections in particular have a shape that follows the cone of the base body. The supporting projections are in particular of essentially trapezoidal design, wherein a widest region points downwards. The shapes of the supporting projections are in particular adapted to a demolding. This in particular allows providing an advantageous design of the supporting projections.

[0086]Beyond this it is proposed that the handle unit has, on a side facing towards the first coupling element, an end face with a circumferential wave-shaped geometry, in particular with a wave-shaped terminal cross-section parallel to the longitudinal axis, wherein on the end face of the handle unit, following the geometry of the end face, the first coupling element is connected with the handle unit. Preferably, the wave-shaped end face of the handle unit forms a transition geometry, wherein the first coupling element adjoins the end face with a step. Preferably, the wave-shaped end face also extends into the orientation groove and forms an end wall of the orientation groove, wherein in order to enable demolding, a last portion of the end wall deviates from the outer wave shape of the end face at a transition into the bottom. The wave-shaped end face has a width that is constant perpendicular to a longitudinal axis. Preferably, the end face has a wave-shaped contour when viewed from a side. Preferably, on the end face a ledge is provided from the first coupling element to the handle unit. A width of the ledge in particular corresponds to the material thickness of the base body of the second coupling element, such that a continuous surface will be formed in the plugged-on state. Preferably, the ledge has the same width circumferentially everywhere. The ledge in particular has a width of 0.5 mm to 4 mm, preferably of 0.5 mm to 2 mm. The ledge in particular includes an angle of at least approximately 90° with the longitudinal axis. The ledge continues on the rear side, in particular into the orientation groove. The profile of the end face is in particular visible on the surface of the product. The profile in particular has a rounded shape and/or round transitions. In a circumferential wave-shaped geometry, the end face in particular forms a height profile that is lowered at the front and at the rear and is raised laterally on the left and right. The lowermost point on the front side and on the rear side is in each case located on the longitudinal axis. The height profile of the end face is in particular realized symmetrically from both sides. A height difference between the front and the rear, measured along the longitudinal axis, is in particular 2 mm to 7 mm, preferably 3 mm to 5 mm. A height difference from the front to the side, measured along the longitudinal axis, is in particular 3 mm to 9 mm, preferably 5 mm to 7 mm. A height difference from the rear to the side, measured along the longitudinal axis, is in particular 1 mm to 4 mm, preferably 1.5 mm to 2.5 mm. The height profile is preferably designed such that the height difference is smaller at the rear than at the front. An angle from the front to the side, with respect to the longitudinal axis, is 35° to 75°, preferably 45° to 65°. An angle from the rear to the side, with respect to the longitudinal axis, is 10° to 50°, preferably 20° to 35°. This in particular allows providing an advantageous transition between the first coupling element and the handle unit. The angle is preferably steeper towards the front than towards the rear. Moreover, this in particular allows providing an advantageous stop for the second coupling element, wherein in particular unambiguous positioning is enabled.

[0087]Alternatively, instead of the rounded wave shape, the end face may have a rather angular wave shape, for example as a result of straight lines which are lined up next to one another and then form quasi a circumferential W-shape or V-shape.

[0088]It is further proposed that the first coupling element is integrally connected with the handle unit. Preferably, the first coupling element is realized integrally with the handle unit. Furthermore, the second coupling element is preferably integrally connected with the application unit. In particular, the second coupling element is realized integrally with the application unit. This in particular allows keeping a number of components small. It is also possible to provide an advantageously stable connection of the coupling unit.

[0089]In particular, advantageously simple coupling of the application unit with the handle unit is achievable by means of the coupling unit. Preferably, during a connection, in particular the application unit that is embodied as a plug-on brush is inserted, wherein an orientation is realized via the orientation groove. In particular, the application unit can be plugged onto the handle unit only in one position. In particular, a stop is realized on the ledge of the end face of the handle unit. In particular, the application unit is inserted until the corresponding latching means latch and the base body of the second coupling element abuts on the ledge of the end face of the handle unit. In terms of geometry, the end face of the application unit is designed in a mirror-inverted manner with respect to the end face of the handle unit. In the assembled state, the two end faces follow each other and at best bear against one another. In addition, in particular a tensioning is induced between the fourth latching means and the end face of the handle unit. In particular, a pull-off weight of the coupling unit is 1 kg to 7 kg, preferably 1.2 kg to 4 kg. The pull-off weight herein in particular depends on several factors. Preferably, the latching means at least partially define the pull-off weight. On the geometric side, the settings may be defined via the dimensions between the latching projections and the latching recesses. In terms of material, a pull-off weight is partly adjustable via the material of the first coupling element and of the second coupling element. For a long service life, the material of the application unit and of the second coupling element is in particular softer than the material of the handle unit and of the first coupling element. Preferably, the handle unit and the first coupling element are made of rPET. Preferentially, the application unit and the second coupling element are made of PP or rPP or a mixture thereof. Further variants are a handle unit made of a co-polyester, such as BR003, and an application unit made of PP or rPP or a mixture thereof, a handle unit made of ABS and an application unit made of PP or rPP or a mixture thereof, or a handle unit made of rather hard PP and an application unit made of softer PP or rPP or a mixture thereof. Due to the softer material of the application unit, said material will cause less abrasion at the first coupling element. Frictional forces between the base body of the first coupling element and the base body of the second coupling element will be minimal. Rather, frictional forces are realized by the interaction of the supporting projections and the base body of the second coupling element. Furthermore, an adaption of the interaction (e. g. of the pull-off forces, tolerances, etc.) may advantageously be realized via the supporting projections and the latching means. The adaption of the interaction is in particular realized at the first coupling element by an adaption of the supporting projections or also of certain elements of the first latching means and of the third latching means. The orientation groove and the guide ridge furthermore serve as an orientation aid and/or alignment aid. As a result, the second coupling element is in particular be insertable only in one position. Even if the application unit is plugged onto the handle unit in a clearly twisted manner, it will automatically be oriented into the intended position when slid on. Because of this, the application unit cannot be oriented and/or plugged onto the handle unit in a manner that is wrong or is different than intended. Due to the orientation groove and of the guide ridge being implemented with further elements, the two coupling elements will find each other during a plugging-on, and this will be possible in a large twisting range. During a plugging-on, automatic orientation of the second coupling element with respect to the first coupling element is realized at least approximately with up to 90°, i. e. up to a 45° deviation in both directions, preferably with up to 140°, i. e. up to a 70° deviation with respect to a correct and/or intended position. Incorrect insertion is thus not possible, not even if there are large angle deviations of the two coupling elements.

[0090]Furthermore, the coupling elements of the coupling unit may be realized as assembled plastic parts, wherein the plastic parts may be mounted on elements that are made of other materials. Thus, for example, a plastic part may be anchored in a handle base body. It is possible that in such a case only one side of the coupling unit or both sides of the coupling unit is/are realized as an assembled plastic part. Thus, in particular further combinations of materials with any type of handles, for example handles made of glass, of wood or of metal, are conceivable.

[0091]The invention is furthermore based on an oral hygiene means, wherein the handle unit comprises at least one material volume body and at least one substantial hollow-space structure, which is at least substantially delimited by the material volume body and which extends at least over a substantial portion of a main extent of the at least one handle unit.

[0092]It is proposed that the material volume body has several recesses, preferably at least three recesses, via which the hollow-space structure is connected to an environment in at least one direction respectively. Preferably, the recesses extend through the material volume body up to the hollow-space structure, such that the hollow-space structure is realized in a partially open fashion.

[0093]A “hollow-space structure” is in particular to mean, in this context, a hollow space and/or several mutually adjoining and/or section-wise interrupted hollow spaces, which is/are at least partially, in particular to a large extent, delimited and/or enclosed by a support structure, in particular the material volume body, of the handle unit. Hollow spaces are at least partially delimited by at least three, four or five sides of the possible six sides.

[0094]Thus it is possible to use 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12 interconnected hollow spaces or hollow spaces which are separate from one another. Preferably, at least 30%, preferably at least 50% and particularly preferably at least 70% of an outer surface of the hollow-space structure is delimited by the support structure, in particular the material volume body, of the handle unit. Preferentially, for any point of the hollow-space structure there is an imaginary straight line which intersects with the point, intersects with the material volume body, then with the point, and then once again with the material volume body. A “substantial hollow-space structure” is in particular to mean, in this context, a hollow-space structure the volume of which is equivalent to at least 20%, preferably at least 30% and particularly preferably at least 40%, of a volume of the handle unit, in particular from the underside up to and with the thumb-gripping region. A “substantial portion” is in particular to mean 30%, preferably at least 50% and particularly preferably at least 70%, of a whole. Preferably, the volume of the handle unit, in particular from the underside up to and with the thumb-gripping region, corresponds to a sum of the volumes of the enclosed hollow-space structure and of the material volume body.

[0095]Preferably, the volume of the enclosed hollow-space structure is in particular between 4 cm³ and 14 cm³ and preferably between 4 cm³ and 11 cm³. The volume of the material volume body of the oral hygiene means may advantageously vary in a very wide range, since the implementations may be quite different from one another. Preferentially, the volume of the material volume body is thus between 3 cm³ and 14 cm³ and preferably between 5 cm³ and 10 cm³. Preferably, the volume of the handle unit, in particular a fully enclosed volume, in particular from the underside up to and with the thumb-gripping region, is in particular between 7 cm³ and 22 cm³ and preferably between 11 cm³ and 19 cm³. With regard to the enclosed hollow-space structure, the material volume body and also the volume of the handle unit, in particular the volumes from the underside up to and with the thumb-gripping region, have been taken into consideration.

[0096]It is generally proposed that the material volume body be advantageously implemented as lightweight as possible. Preferentially, the weight of the oral hygiene means is preferably less than 18 g. Preferably, the weight of the oral hygiene means is in particular in a range between 4 g and 18 g, preferentially in a range between 5 g and 15 g, particularly preferentially between 6 g and 10 g. This allows the user an advantageously simple and advantageously quite precise guidance since less mass has to be moved. In addition, this will reduce the potential of injury due to incorrect manipulations and/or incorrect movements.

[0097]In a region delimiting the hollow-space structure, the material volume body preferably has a small wall thickness. In a region delimiting the hollow-space structure, a wall thickness of the material volume body is in particular 0.6 mm to 5.5 mm and preferably 1.5 mm to 4 mm.

[0098]Creating hollow-space structures allows saving between 30% and 60% of volume compared to a filled volume. This is calculated as a created empty volume compared to the filled continuous volume. Due to the implementation of the handle unit, in particular the center of gravity is in a pure plastic product displaced with respect to the filled body towards the application unit. The center of gravity is in the region of the thumb grip and/or thumb rest (preferably substantially in a region from the middle to the rear end, depending on a material selection). In the case of customary oral hygiene means, however, the center of gravity is below the thumb grip and/or thumb rest. The center of gravity in the region of the thumb rest has the advantage that the application unit can thus be guided even more directly and/or more precisely. The hollow-space structures mostly concern the handle unit. Due to the described implementation of the coupling unit, the application unit is already realized with thin walls. This in particular allows keeping material input for the oral hygiene means at a low level. It is furthermore in particular possible to provide a voluminous handle unit. This in particular allows providing an advantageously ecological oral hygiene means. It is moreover possible to provide a certain holding volume—and thus holding without problems—despite a reduced material volume. In particular, a dynamic, visually appealing design is achievable. The design is in particular suitable for a biodegradable brush due to the low material requirement and the thin-walled implementation.

[0099]Preferably, the material volume body has defined recesses. Herein preferentially in particular between three and fifteen recesses, preferably between four and twelve recesses, are realized per side. Preferably, apart from the recesses, the material volume body delimits the hollow-space structure completely. Viewed from the front, the recesses which enter the material volume body from the front side are at least partially delimited by the material volume body laterally to the left and to the right, as well as at the top, at the bottom and at the rear (rear side). Viewed from the rear side, the recesses which enter the material volume body from the rear side are at least partially delimited by the material volume body laterally to the left and to the right, as well as at the top, at the bottom and at the front (front side). The mentioned conditions may be implemented individually or in combination. The recesses are per each side preferably realized so as to be unconnected, each having an area, i.e. a cross section, of at most 3 cm², preferably at most 2 cm², and particularly preferably at most 1 cm². The recesses located on different sides of the body may in particular meet along the longitudinal axis, such that break-throughs are formed between the recesses. The hollow-space structure is in particular arranged at least in the voluminous portions of the handle unit. It forms, at least in subregions, a honeycomb-like structure alternatingly on the two sides, and it is realized by the offset recesses. Preferably the material volume body has a small wall thickness in a region that delimits the hollow-space structure. The recesses may in particular have different orientations. In particular, the recesses may be introduced lengthwise (i.e. parallel), transversely or at an angle with respect to the longitudinal axis. The angle may herein be between 0° and 90°. This advantageously allows the recess assuming any angle between the lengthwise and the transverse orientation. Moreover, different shapes of the recesses are conceivable which are deemed expedient by someone skilled in the art, such as for example substantially circular, oval, elliptical, rectangular, diamond-shaped, triangular, polygonal, rhombus-shaped, parallelogram-shaped or the like. The recesses may in particular be arranged at different positions on the oral hygiene means, such as in particular on the handle unit, for example the thumb-gripping region, and/or on the application unit, for example the neck region or the head region, in particular at the brush head. In the implementation of a recess in the thumb-gripping region, the size or position of the recess is chosen such that the thumb is comfortably supported in the edge region of the recess. For pleasant haptics, the material volume body is strongly rounded or chamfered in the edge region of the recess. In this way the support surface is augmented and sharp edges are smoothed. The thumb preferably covers a substantial part or the entire recess from above. In particular, in this context a multi-component implementation, in particular of the material volume body, is also conceivable. Preferably portions of the outer structure may be made of a soft component. Such an oral hygiene means may in particular be produced in a method, in particular an injection-molding method, according to WO 2007/030958 A1. The method described in the document WO 2007/030958 A1 shall therefore in particular be considered as part of the disclosure of the present invention.

[0100]Along the longitudinal axis, a recess may be formed from the underside. This recess merges into the hollow-space structure, which connects the other recesses and/or is realized by the other recesses.

[0101]Beyond this, it is proposed that, starting from a geometric center point of the hollow-space structure, the directions are angled by at least 80° relative to one another. Preferably, one recess is open at least towards a rear side, one recess is open at least to a lefthand side, and one recess is open at least to a righthand side. As a result, it is possible to generate an advantageously lightweight and, despite everything, stable structure. This in particular allows keeping material input for the oral hygiene means at a low level. This in particular allows providing an advantageously ecological oral hygiene means. Preferably, the recesses also result in improved haptics.

[0102]The recesses and the hollow-space structure in particular allow a saving of material. In particular, the volumes are not fully realized but are provided with hollow spaces. The hollow-space structure and the recesses may in particular extend from the lower end of the handle into the region where the neck of the application unit starts. Preferably, the thumb grip is also comprised in the structures. Preferably a single recess, respectively its boundary and/or its edge region, at least partially forms the thumb grip. Preferably the edge region of the thumb-gripping recess is designed differently from the edge region of other recesses. An implementation of the recesses is in particular possible in the neck. In particular, the lateral recesses may extend into the neck. In the neck, the recesses allow achieving and/or adjusting flexibility since the structure is weakened to a certain extent. Recesses in the handle unit may be used for complete and/or integral oral hygiene products as well as for separable oral hygiene products, for example toothbrushes with exchangeable heads. Viewed from the front or the rear, the handle unit as a whole in particular has a waisted shape with three bellies and with narrower regions in between. Preferably, one belly is in the region of the lower handle end, one belly is in the region of the upper handle end and one belly is in the region of the thumb grip. Viewed from the side, the handle unit has an elevation in the region of the thumb grip, which extends in a curved manner towards the brush head. Preferably, a support point of the oral hygiene means is provided in the neck region of the application unit and in a region of the lower handle end, directly at the handle end or in the last third of the total length. Furthermore, various optical effects may be created, for example using transparent and/or translucent materials. With different material thicknesses of the walls and with projections, it is in particular possible that different amounts of light penetrate through the body and optical effects (e.g. facet-like, crystal-like, honeycomb-like optical effects) are produced.

[0103]It is furthermore proposed that the hollow-space structure is completely enclosed by the material volume body in at least one plane parallel to a main extension plane of the handle unit. Preferably the hollow-space structure is completely enclosed by the material volume body in the main extension plane of the handle unit. This in particular allows keeping material input for the oral hygiene means at a low level. This in particular allows providing an advantageously ecological oral hygiene means.

[0104]It is also proposed that the material volume body has at least two at least substantially oval recesses, a first recess being arranged on a front side of the handle unit and a second recess being arranged on the rear side of the handle unit, offset from the first recess along the main extension direction of the handle unit. The recesses may have different sizes. The recesses in particular allow keeping a material input for the oral hygiene means at a low level. This in particular allows providing an advantageously ecological oral hygiene means. Alternatively to an oval shape, other shapes are also conceivable, for example a circular shape or a polygonal shape with rounded edges. Preferably, the recesses do not extend completely through the handle unit. Furthermore, the recesses on the front side and on the rear side are in particular not congruent. The recesses at the front and at the rear are in particular arranged offset. The first recesses on the front side in particular extend as far as a web on the rear side, while the recesses on the rear side in particular extend as far as a web on the front side. Preferably, closed recesses are not arranged over the entire volume body. Some of the structures are in particular realized only partially, for example in the edge regions. Preferably the recesses form a pattern (for example a honeycomb-like pattern) on a surface of the handle unit. Preferably, the pattern formed by the recesses is symmetrical to the longitudinal axis. Preferentially the material volume body has several first recesses and several second recesses, wherein the first and second recesses alternate along the longitudinal axis, such that the recesses alternate on the front side and on the rear side. Preferably, respectively one web is arranged between the first recesses. Preferably, respectively one web is arranged between the second recesses. The first recesses are in particular arranged on a front side of the handle unit, distributed along a middle axis. The second recesses are arranged on the rear side of the handle unit, offset with respect to the first recesses. The second recesses are arranged along the longitudinal axis, in particular in each case with a center point offset with respect to the first recesses. The second recesses are arranged along the longitudinal axis, in particular in each case between the first recesses. Preferentially, the recesses in particular have different sizes, wherein a largest recess is in particular realized as a lower second recess, which is in particular arranged behind an embossing surface. In particular, an embossing surface is provided on the volume body on the front side. Preferably, the embossing surface is attached in a lower region of the volume body. Preferably, the embossing surface is realized as a web. Preferably, the web forms a boundary surface of a recess. Between the recesses, in particular break-throughs are realized which form the hollow-space structure. The break-throughs are the result of intersecting recesses. Preferably, the first recesses and the second recesses are arranged overlapping in an inner space of the handle unit. Preferably, all first and second recesses are connected to one another via break-throughs, such that a large hollow space is formed which extends over a large portion of a main extent of the handle unit. The recesses are in particular delimited by webs of the material handle body. The webs in particular have a minimum width of 2.5 mm to 5 mm, preferably 3 mm to 4 mm, and a maximum width, in particular in a region of the embossing surface, of 6 mm to 12 mm, preferably 7 mm to 10 mm. The embossing surface in particular serves to provide a surface for applying a lettering or logos, for example by embossing. In one variant, it would be conceivable that a lettering is provided in the injection-molding tool as a recessed or raised structure which forms a lettering in the respective region on the web.

[0105]Preferably, the embossing surface is integrated in the structure, in particular between two recesses. The embossing surface is in particular realized as a rather large planar surface.

[0106]The material volume body preferably has two to eight, preferably two to six, first recesses and two to eight, preferably two to six, second recesses. Herein smaller and larger recesses in particular are provided, wherein smaller recesses in particular have a length of 12 mm to 21 mm, preferably of 14 mm to 18 mm, and larger recesses in particular have a length of 20 mm to 38 mm, preferably of 28 mm to 35 mm. The larger recesses are in particular arranged in a region of the embossing surface. The width of the individual recess is in particular 4 mm to 13 mm, preferably 5.5 mm to 11 mm. The distance between the recesses on each side is, in particular in the case of the smaller recesses, from center of the recess to center of the recess, 20 mm to 45 mm, preferably 25 mm to 35 mm. The recesses are in particular laterally delimited by a wall of the material volume body, wherein a wall thickness laterally of the oval recesses is 1 mm to 8 mm, preferably 1.5 mm to 5 mm. The height of the webs at the end of the closed recess is in particular 0.5 mm to 4 mm, preferably 1 mm to 2.5 mm. A shape separation of the handle unit is in particular arranged in a middle region of the volume body and extends between the partial recesses on the side.

[0107]It is moreover proposed that the material volume body has at least two at least substantially semi-oval recesses, which are arranged on a front side of the handle unit, said recesses being arranged along a main extension direction of the handle unit at a level of the second oval recess. The semi-oval recesses on the front side are in particular arranged opposite the at least one second oval recess. On the front side, the semi-oval recesses are arranged laterally offset with respect to the at least one first oval recess. Preferably the material volume body has on the front side two to sixteen, preferably two to twelve, semi-oval recesses. The semi-oval recesses are in particular arranged on an outer edge of the front side. On the front side, the lowermost semi-oval recesses are realized as larger recesses, wherein the embossing surface and/or a larger web are/is arranged between the larger semi-oval recesses. The semi-oval recesses are respectively arranged on the front side as pairs, wherein the pairs of semi-oval recesses are respectively arranged on both sides of the longitudinal axis at the same level. The semi-oval recesses on the front side each form a break-through to a second oval recess on the rear side. The break-throughs are realized at least partly laterally and towards a front side. On the front side, the semi-oval recesses respectively form the last recesses at the bottom. On the front side, the semi-oval recesses respectively form a termination at the bottom. On the rear side, a second oval recess forms the last element at the bottom. On the rear side, a second oval recess respectively forms a termination at the bottom. The semi-oval recesses extend as far as the lateral edge of the handle unit. The semi-oval recesses are in particular open towards a side and in particular taper out towards an edge of the volume body. The first oval recesses, the second oval recesses and the semi-oval recesses are preferably larger in the longitudinal direction than in the transverse direction. This in particular allows creating further recesses in spite of the limited surface of the handle unit. This in particular allows keeping a material input for the oral hygiene means at a low level.

[0108]This in particular allows providing an advantageously ecological oral hygiene means. As a result, in particular pleasant haptics can be created.

[0109]It is furthermore proposed that the material volume body has at least two further at least substantially semi-oval recesses, which are arranged on a rear side of the handle unit, said recesses being arranged along a main extension direction of the handle unit at a level of the first oval recess. On the rear side, the further semi-oval recesses are arranged laterally offset with respect to the at least one second oval recess. Preferably, the material volume body has on the rear side two to sixteen, preferably two to twelve, further semi-oval recesses. The further semi-oval recesses are in particular arranged on an outer edge of the rear side. The further semi-oval recesses are respectively arranged on the rear side as pairs, wherein the pairs of semi-oval recesses are respectively arranged on both sides of the longitudinal axis at the same level. The further semi-oval recesses on the rear side each form a break-through to a first oval recess on the front side. The break-throughs are realized at least partly laterally and towards a front side. The further semi-oval recesses extend as far as the lateral edge of the handle unit. The further semi-oval recesses are in particular open towards a side and in particular taper out towards an edge of the volume body. The semi-oval recesses in particular form lateral interruptions in the outer shape of the volume body, wherein a continuous web is provided in the longitudinal direction between the semi-oval recesses of the front side and the further semi-oval recesses of the rear side. In particular, a shape separation extends on the web. The shape separation has a continuous progression without jumps and goes on continuously towards the coupling unit and/or the neck of the application unit. This in particular allows creating further recesses despite the limited surface of the handle unit. This in particular allows keeping a material input for the oral hygiene means at a low level. This in particular allows providing an advantageously ecological oral hygiene means.

[0110]Furthermore, it is proposed that the at least substantially semi-oval recesses extend at least substantially perpendicularly to a main extension plane of the handle unit, wherein the at least substantially semi-oval recesses do not extend through a middle plane that extends parallel to the main extension plane through a geometric center point of the handle unit. Preferably the at least substantially semi-oval recesses are introduced in the volume body at least substantially perpendicularly to a main extension plane of the handle unit. A “middle plane” of a structural unit is in particular to mean a plane which is parallel to a largest side surface of a smallest imaginary cuboid just still completely enclosing the structural unit, and which extends through the center point of the cuboid. The semi-oval recesses in particular form lateral interruptions in the outer shape of the volume body, wherein a continuous web is provided in the longitudinal direction between the semi-oval recesses of the front side and the further semi-oval recesses of the rear side. This in particular allows providing an advantageously stable structure of the material volume body.

[0111]It is also proposed that the at least substantially oval recesses extend at least substantially perpendicularly to a main extension plane of the handle unit, wherein the at least substantially oval recesses extend through a middle plane that extends parallel to the main extension plane through a geometric center point of the handle unit. The at least one first recess in particular extends as far as the at least one web on the rear side, which is arranged between two further semi-oval recesses. The at least one second recess in particular extends as far as the at least one web on the front side, which is arranged between two semi-oval recesses. This in particular allows providing an advantageously lightweight structure of the material volume body. It is furthermore in particular possible to provide an advantageous hollow-space structure.

[0112]It is further proposed that there is an imaginary straight line which extends perpendicularly to the main extension plane of the handle unit and which extends, free from an intersection point with the material volume body, through the at least one first oval recess and the at least one second oval recess. Preferably the imaginary straight line in particular extends through a break-through between the first oval recess and the second oval recess. Preferably there is also an imaginary straight line which extends perpendicularly to the main extension plane of the handle unit and which extends, free from an intersection point with the material volume body, through one of the semi-oval recesses and the at least one second oval recess. Preferably there is also an imaginary straight line which extends perpendicularly to the main extension plane of the handle unit and which extends, free from an intersection point with the material volume body, through one of the further semi-oval recesses and the at least one first oval recess. Preferably there is also an imaginary straight line which extends parallel to the main extension plane of the handle unit and perpendicularly to the longitudinal axis and which extends, free from an intersection point with the material volume body, through two of the semi-oval recesses and the at least one second oval recess. Preferentially there is also an imaginary straight line which extends parallel to the main extension plane of the handle unit and perpendicularly to the longitudinal axis and which extends, free from an intersection point with the material volume body, through two of the further semi-oval recesses and the at least one first oval recess. This in particular allows providing an advantageously lightweight structure of the material volume body. It is furthermore in particular possible to provide an advantageous hollow-space structure.

[0113]It is moreover proposed that at least two at least substantially semi-oval recesses open into the second oval recess. Preferably in each case a break-through is arranged between the two at least substantially semi-oval recesses and the second oval recess. Preferentially at least two further at least substantially semi-oval recesses open into the first oval recess. Preferably in each case a break-through is arranged between the two further at least substantially semi-oval recesses and the first oval recess. This in particular allows providing an advantageously lightweight structure of the material volume body. It is furthermore in particular possible to provide an advantageous hollow-space structure.

[0114]Beyond this it is proposed that the material volume body is sloped towards the first oval recess and forms a thumb-gripping region. Preferably a web and a wall of the material volume body which delimits the first oval recess are chamfered, broken and/or rounded towards the recess. The thumb grip is realized partly with the chamfer and partly with the recess. The first oval recess is realized in the shape of an ellipse having a longitudinal axis in the direction of the longitudinal axis of the handle unit. As a result, a depression is formed which allows optimum placement of the thumb. In particular a web, which is at the rear rounded against the longitudinal axis for a placement of the index finger, is arranged on a rear side that faces away from the thumb-gripping region. The web in particular forms an index finger gripping region. This in particular allows providing an advantageously ergonomic handle unit.

[0115]It is further proposed that the hollow-space structure is at least approximately completely covered by the material volume body from the front. Preferably, a front side of the material volume body is realized such that it is not completely closed, but recesses are oriented at least substantially perpendicularly to the front side. This in particular allows achieving an advantageously homogeneous appearance of the handle unit. Moreover, it is in particular possible to provide an advantageously ergonomic handle unit.

[0116]Furthermore, it is proposed that the material volume body has in at least one region several strand elements (for example three, four, six, seven, eight or nine, preferably five strand elements), which are spaced apart from one another in a first region of the handle unit and are arranged in a contacting manner in at least one second region of the handle unit. It is also possible that several spaced-apart or contacting regions are realized. Preferably, the strand elements extend in the form of undulations which are partially offset with respect to one another. In regions in which the strand elements are arranged offset with respect to one another and move away from one another, it is in particular possible that recesses are formed in the transverse direction. The recesses are in particular visible laterally (this means that, viewed laterally, recesses may be formed which allow a view through the handle unit) and are produced by cores or cavity walls which contact one another during manufacturing. Preferably, recesses may be realized which, viewed laterally, allow a view through the handle unit or at least into the hollow-space structure. In a region of the recesses, in particular cores contact one another for manufacturing, said cores forming the rear side and forming the front side. However, it would also be conceivable that no recesses are provided between the strand elements, the strand elements extending close to one another such that a closed side surface is formed. The recesses between the strand elements extend through the volume body substantially in a transverse direction, wherein the recesses may also extend through the volume body partly perpendicularly to a main extension plane. Viewed from the front side to the rear side, the recesses are in particular slit-shaped. The recesses may extend at least partly in parallel. Viewed laterally, the recesses may extend at least partly laterally above one another. On the rear side, a depression is formed which is delimited by the strand elements and forms the hollow-space structure. The strand elements are in particular not straight. The strand elements move in the width, laterally from the left side to the right side, and in the height, i.e., from the front side to the rear side. The strand elements thus form a plurality of undulations, which are at least partly offset. The individual strand elements in particular in each case form at least one complete undulation. The strand elements in particular form a complete undulation, at least when viewed in the transverse direction. Preferably at least four strand elements are provided, which in each case extend in a wave-shaped manner when viewed in the transverse direction and when viewed perpendicularly to a main extension plane. The strand elements extend at least partly in opposed directions, such that one strand element may be rather in the region of a wave trough while another strand element is designed rather as a wave crest. Preferably, viewed in the transverse direction, outer strand elements extend in a direction opposed to an inner strand element. Preferably, viewed perpendicularly to a main extension plane, the outer strand elements extend in opposed directions with respect to each other. Preferably, viewed perpendicularly to a main extension plane, the middle strand elements extend in opposed directions with respect to each other. Furthermore, in each case nodal points are formed between neighboring strand elements. The nodal points in each case form contact points of the strand elements, in which the strand elements are connected. One nodal point is in particular arranged at the bottom at the end of the handle unit. In particular, further nodal points are provided, wherein different strand elements may have different nodal points. The strand elements in particular respectively extend from bottom to top over the entire handle unit, wherein the recesses decrease in size from bottom to top in the transverse direction. Alternatively, it would also be conceivable that the strand elements taper out in a nodal point in the region of the thumb-gripping region and/or of the neck region of the application unit, such that a smooth body is formed in the neck region. The recesses in the volume body in particular extend in such a way that they form a depression at the bottom on the rear side of the handle unit. In particular, a thumb-gripping region is realized in an upper region of the handle unit. The thumb-gripping region is in particular formed by the strand elements, wherein the inner strand element forms the main support surface for the thumb-gripping region. The thumb grip is realized at least with a strand element forming a undulation which, viewed laterally, rises towards the application unit. In particular, structures may be realized on the main support surface which improve holding and reduce a slipping of the thumb. In order for something like a hollow to be realized, the middle and outer strand elements are in this region realized in a somewhat opposed manner. The outer strand elements in particular form lateral boundaries, preferably lateral elevations. The outer shape of the handle unit is realized laterally by the outer strand elements, while the strand elements alternate on the front side and on the rear side. This in particular allows providing an advantageously ergonomic handle unit.

[0117]The volume body is in particular constructed symmetrically in the transverse direction, wherein the outer strand elements are mirrored and the middle strand elements are mirrored. The inner strand element is constructed symmetrically and wider than the others. The inner strand element forms an embossing surface at the bottom and forms at the top the major portion of the thumb-gripping region. The embossing surface in particular serves to provide a surface for applying lettering or logos, for example by embossing. In one variant, it would be conceivable that a lettering is provided in the injection-molding tool as a recessed or raised structure which forms a lettering in the respective region on the strand. The middle strand elements continue the undulating shape of the inner strand element perpendicularly to a main extension plane and are arranged partially offset with respect to the inner strand element. The outer strand elements continue the undulating shape of the middle strand elements perpendicularly to a main extension plane and are arranged partially offset with respect to the middle strand elements. A number of strand elements is in particular three to nine, preferably three to six. The outer and the middle strand elements in particular have a constant width, wherein the inner strand element in particular realizes a profile in the width. The inner strand element has a minimum width of 1 mm to 4 mm, preferably 1.5 mm to 3 mm, and a maximum width of 6 mm to 12 mm, preferably 7 mm to 10 mm. The outer and the middle strand elements have a width of 0.8 mm to 4 mm, preferably 1 mm to 3 mm. The height of the individual strand elements is in particular 2 mm to 7 mm, preferably 2.5 mm to 6 mm. It is herein in particular conceivable that a profile is formed and the individual strand elements are not always of the same height. A cross-section area perpendicular to a longitudinal axis of the individual strand elements is in particular 4 mm² to 30 mm², preferably 4.5 mm² to 26 mm². The inner strand element in particular has a largest cross-section in the region of the embossing surface or of the thumb-gripping region. A cross-section of the outer and middle strand elements is in particular substantially constant. The middle strand elements in particular have a smallest cross-section. The strand elements in particular have a rectangular and/or square cross-section shape. However, a polygonal, round or oval cross-section shape would also be conceivable. The strand elements in particular have a closed shape. The cross-section of the strand elements may be realized as a profile, such that shapes may merge into one another. In principle, the cross-section of the strand elements is also given by the manufacture: since the body is produced by the injection molding method, demoldability must also be provided. The cross-section shape of the handle unit is derived from the arrangement of the strands. The material volume body in particular consists of the strand elements. The handle unit may have a triangular and/or V-shaped cross-section shape, wherein the inner strand element and the outer strand elements respectively form the points of maximum height and depth. Herein the outer strand elements in particular form the widest region of the handle unit and the inner strand element in particular forms the highest points. Alternatively, a rather round cross-section shape of the handle unit may be realized, wherein the inner strand element forms the highest points, the middle strand elements form the point of maximum depth and the outer strand elements form the widest point.

[0124]It is not necessary for each strand element to be equipped with the same surface properties. To give an example, only certain strand elements on the front side are equipped with non-smooth surfaces. Like the strand elements, the surface properties of the strand elements are also preferably constructed symmetrically. By way of example, in each case only the middle strand element is provided with a non-rough surface.

[0125]Furthermore, a side of a strand element does not have to be provided completely with the same surface characteristics. For example, only a portion of the surface may be provided with a certain roughness, for example only in the lower third or only a band in the longitudinal direction, etc.

[0126]The non-smooth surfaces are created in the injection-molding tool. The surface roughness in the injection-molding tool is preferably between Rz=6.3 and Rz=25. For this purpose, in particular rough eroded surfaces are provided in the injection-molding tool.

[0127]In a respective implementation, a shape separation is in particular arranged on the outer strand elements. The shape separation in particular forms a continuous progression, free of jumps, on the outermost strand elements. The shape separation in particular continues towards the application unit. The shape separation is in particular arranged on a middle region with regard to height.

[0128]Manufacturing by means of an injection molding process provides that the handle unit is injection-molded onto the longitudinal axis in the region of the index finger portion, i. e. on the rear side (position of the injection point). The plug-on brush is likewise injection-molded onto the longitudinal axis on the rear side in the region towards the handle body (position of the injection point). The positioning is given by the theory that injection is to be carried out in a region of greater material thickness and thin portions should be located at the end of the flow path of the injection mass.

[0129]The invention is furthermore based on an application unit of an oral hygiene means.

[0130]The oral hygiene means according to the invention shall here not be limited to the above-described applications and implementations. In particular, in order to fulfil a functionality that is described here, the oral hygiene means according to the invention may have a number of individual elements, components and units, and/or any expedient combination thereof, that differs from a number given here. In addition, for the value ranges specified in this disclosure, values situated within the stated limits shall also be considered as disclosed and as usable according to requirements.

[0131]Of course, the design variants shown in this document are exemplary. Within the scope of the invention, the individual implementations and elements of these design variants may be combined with other design variants without departing from the scope of this invention.

DRAWINGS

[0132]Further advantages will become apparent from the following description of the drawings. Three exemplary embodiments of the invention are shown in the drawings. The drawings, the description and the claims contain numerous features in combination. Someone skilled in the art will purposefully also consider the features individually and will find further expedient combinations.

[0133]In the drawings:

[0134]FIG. 1 shows an oral hygiene means according to the invention, with an application unit, a handle unit and a coupling unit, in a perspective view from the front,

[0135]FIG. 2 shows the oral hygiene means according to the invention, with the application unit, the handle unit and the coupling unit, in a perspective view from the rear,

[0136]FIG. 3 shows a front side of the oral hygiene means according to the invention, with the application unit, the handle unit and the coupling unit, in a schematic illustration,

[0137]FIG. 4 shows a side of the oral hygiene means according to the invention, with the application unit, the handle unit and the coupling unit, in a schematic illustration,

[0138]FIG. 5 shows a rear side of the oral hygiene means according to the invention, with the application unit, the handle unit and the coupling unit, in a schematic illustration,

[0139]FIG. 6 shows the oral hygiene means according to the invention, with the application unit, the handle unit and the coupling unit, in a sectional view along the section line A-A in FIG. 3,

[0140]FIG. 7 shows the handle unit of the oral hygiene means according to the invention, in a perspective view from the front,

[0141]FIG. 8 shows the handle unit of the oral hygiene means according to the invention, in a perspective view from the rear,

[0142]FIG. 9 shows a front side of the handle unit of the oral hygiene means according to the invention, in a schematic illustration,

[0143]FIG. 10 shows a side of the handle unit of the oral hygiene means according to the invention, in a schematic illustration,

[0144]FIG. 11 shows a rear side of the handle unit of the oral hygiene means according to the invention, in a schematic illustration,

[0145]FIG. 12 shows the handle unit of the oral hygiene means according to the invention, in a schematic plan view in the longitudinal axis direction,

[0146]FIG. 13 shows the handle unit of the oral hygiene means according to the invention, in a sectional view along the section line B-B in FIG. 10,

[0147]FIG. 14 shows the handle unit of the oral hygiene means according to the invention, in a sectional view along the section line A-A in FIG. 9,

[0148]FIG. 15 shows a partial cutout of a side of the handle unit of the oral hygiene means according to the invention, in a schematic illustration,

[0149]FIG. 16 shows a first coupling element of the coupling unit of the oral hygiene means according to the invention, in a sectional view along the section line C-C in FIG. 15,

[0150]FIG. 17 shows the first coupling element of the coupling unit of the oral hygiene means according to the invention, in a sectional view along the section line D-D in FIG. 15,

[0151]FIG. 18 shows the first coupling element of the coupling unit of the oral hygiene means according to the invention, in a sectional view along the section line E-E in FIG. 15,

[0152]FIG. 19 shows the first coupling element of the coupling unit of the oral hygiene means according to the invention, in a sectional view along the section line F-F in FIG. 15,

[0153]FIG. 20 shows the application unit of the oral hygiene means according to the invention, in a perspective view from the front,

[0154]FIG. 21 shows the application unit of the oral hygiene means according to the invention, in a perspective view from the rear,

[0155]FIG. 22 shows a front side of the application unit of the oral hygiene means according to the invention, in a schematic illustration,

[0156]FIG. 23 shows a side of the application unit of the oral hygiene means according to the invention, in a schematic illustration,

[0157]FIG. 24 shows a rear side of the application unit of the oral hygiene means according to the invention, in a schematic illustration,

[0158]FIG. 25 shows the application unit of the oral hygiene means according to the invention, in a schematic plan view in the longitudinal axis direction from below,

[0159]FIG. 26 shows the application unit of the oral hygiene means according to the invention, in a sectional view along the section line A-A in FIG. 22,

[0160]FIG. 27 shows the application unit of the oral hygiene means according to the invention, in a sectional view along the section line B-B in FIG. 23,

[0161]FIG. 28 shows a second coupling element of the coupling unit of the oral hygiene means according to the invention, in a sectional view along the section line G-G in FIG. 23,

[0162]FIG. 29 shows the second coupling element of the coupling unit of the oral hygiene means according to the invention, in a sectional view along the section line H-H in FIG. 23,

[0163]FIG. 30 shows an alternative oral hygiene means according to the invention, with an application unit and a handle unit, in a perspective view from the front,

[0164]FIG. 31 shows the alternative oral hygiene means according to the invention, with the application unit and the handle unit, in a perspective view from the rear,

[0165]FIG. 32 shows a front side of the alternative oral hygiene means according to the invention, with the application unit and the handle unit, in a schematic illustration,

[0166]FIG. 33 shows a side of the alternative oral hygiene means according to the invention, with the application unit and the handle unit, in a schematic illustration,

[0167]FIG. 34 shows a rear side of the alternative oral hygiene means according to the invention, with the application unit and the handle unit, in a schematic illustration,

[0168]FIG. 35 shows the alternative oral hygiene means according to the invention, with the application unit and the handle unit, in a sectional view along the section line I-I in FIG. 33,

[0169]FIG. 36 shows the alternative oral hygiene means according to the invention, with the application unit and the handle unit, in a sectional view along the section line J-J in FIG. 33,

[0170]FIG. 37 shows the alternative oral hygiene means according to the invention, with the application unit and the handle unit, in a sectional view along the section line K-K in FIG. 33,

[0171]FIG. 38 shows the alternative oral hygiene means according to the invention, with the application unit and the handle unit, in a sectional view along the section line L-L in FIG. 33,

[0172]FIG. 39 shows an alternative oral hygiene means according to the invention, with an application unit, a handle unit and a coupling unit, in a perspective view from the front,

[0173]FIG. 40 shows a side of the oral hygiene means according to the invention, with the application unit, the handle unit and the coupling unit, in a schematic exploded view, and

[0174]FIG. 41 shows an alternative oral hygiene means according to the invention, with an application unit and a handle unit, in a perspective view from the front.

DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

[0175]FIG. 1 shows a front side 82a of an oral hygiene means 10a, in a schematic perspective view. In the present case, the oral hygiene means 10a is realized as a toothbrush. The oral hygiene means 10a is realized as a manual toothbrush. The oral hygiene means 10a is realized as an exchangeable-head toothbrush. The oral hygiene means 10a could also be realized as a flosser, a single-tuft brush, an interdental cleaner, a tongue cleaner or the like. In addition, combined oral hygiene means 10a are conceivable, which combine at least two different functions, for example a toothbrush with a tongue cleaner, a toothbrush with massaging elements or the like.

[0176]The oral hygiene means 10a comprises an application unit 12a. The oral hygiene means 10a further comprises a handle unit 16a. The handle unit 16a is realized as a manual handle unit 16a. The at least one handle unit 16a is made of a single material.

[0177]In the following, reference is made to FIGS. 1 to 29, which show different views of the oral hygiene means 10a, the handle unit 16a and the application unit 12a. Since there are different views, some elements are not shown in all the figures and are accordingly not provided with reference numerals in all the figures.

[0178]The oral hygiene means 10a has a longitudinal axis 38a, a height axis 122a and a width axis 124a. The longitudinal axis 38a is arranged parallel to a main extension direction 126a of the oral hygiene means 10a. The longitudinal axis 38a is furthermore equivalent to a longitudinal axis of the handle unit 16a. If the oral hygiene means 10a is placed with its rear side 84a on a flat surface, such that the longitudinal axis 38a is arranged parallel to the surface, the height axis 122a is arranged perpendicular to the longitudinal axis 38a and perpendicular to the surface and to the width axis 124a. The width axis 124a is arranged perpendicular to the longitudinal axis 38a and perpendicular to the height axis 122a. In the present case, the oral hygiene means 10a has a length, in particular parallel to the longitudinal axis 38a of the oral hygiene means 10a, of 130 mm to 210 mm and preferably of 180 mm to 200 mm. Furthermore, the oral hygiene means 10a has a maximum width, in particular parallel to the width axis 124a of the oral hygiene means 10a, of 10 mm to 20 mm and preferably of 12 mm to 17 mm. The oral hygiene means 10a further has-without bristles-a height, in particular measured parallel to the height axis 38a, of 10 mm to 17 mm and preferably of 12 mm to 15 mm.

[0179]The application unit 12a is realized as a plug-on part. The application unit 12a is realized so as to be separable, in particular separable without tools, from the handle unit 16a. The application unit 12a is realized by way of example as a plug-on brush. In principle, however, a different implementation of the application unit 12a, deemed expedient by someone skilled in the art, would also be conceivable. The application unit 12a has a base body 14a. The application unit 12a comprises a head region 94a. The head region 94a forms a brush head of the oral hygiene means 10a. In the present case, the head region 94a is realized as a toothbrush head. The head region 94a in particular has a base body that is realized as a bristle carrier. A base body of the head region 94a is realized completely from a hard component. However, it would also be conceivable that the base body of the head region 94a is made of a hard component and a soft component. The base body of the head region 94a forms a bristle carrier. The oral hygiene means 10a further comprises a cleaning zone 96a, which is accommodated in the head region 94a and comprises a plurality of bristle bundles. At least one recess is formed on the front side 82a of the head region 94a. The at least one recess is configured to receive a bristle bundle. The head region 94a has a plurality of recesses. The recesses are realized as bristle holes. Any suitable bristles are possible, which may for example be punched on in the anchor-punching method, as has been described above In principle, using anchor-free methods would also be conceivable. In this way, an anchor-free oral hygiene means 10a, and thus an oral hygiene means 10a without metal, could be provided as the anchor wire can be dispensed with. In the case of certain anchor-free methods, a recess, configured to accommodate a platelet parallel to the handle unit 16a, is provided in the head region 94a. The platelet is in particular produced by an injection-molding method, with the platelet being already furnished with bristles before the fastening. The platelet is configured to be anchored in the recess of the head region 94a, in particular by welding. Bristle bundles may differ with regard to their length, their composition, their number of bristles, a bristle material, a color, a surface structuring and the like. Likewise, angles at which the bristles and/or the bristle bundles are arranged relative to one another or to a surface of the base body of the head region 94a may vary between bristles and/or between bristle bundles. In the present case, the application unit 12a moreover comprises at least one neck region 98a, which in particular connects the head region 94a to the handle unit 16a via a coupling unit 20a. The neck region 98a forms a neck. The base body 14a of the application unit 12a comprises the head region 94a and the neck region 98a.

[0180]The application unit 12a is arranged on the upper side of the oral hygiene means 10a. The application unit 12a forms an uppermost point of the oral hygiene means 10a. By way of example, the application unit 12a is made completely of a hard component. However, it would also be conceivable that the application unit 12a is made partly of a soft component and partly of a hard component. With regard to suitable soft and/or hard components, reference is made to the above description. In principle, the application unit 12a may comprise at least one tongue cleaner element. The tongue cleaner element may in particular have nubs and/or lamellae. The tongue cleaner element is preferably arranged on the rear side of the head region 94a, and it may in particular be arranged on a ring made of a soft component and/or on an island made of a hard component.

[0181]The neck region 98a forms a transition between the application unit 12a and a second coupling element 24a of the coupling unit 20a. The neck region 98a is made of the hard component. The neck region 98a is realized integrally with the head region 94a. The head region 94a and the neck region 98a form the base body 14a of the application unit 12a.

[0182]The handle unit 16a has a base body 18a. The handle unit 16a furthermore has a material volume body 62a and a substantial hollow-space structure 64a. The material volume body 62a forms the base body 18a. The substantial hollow-space structure 64a is at least substantially delimited by the material volume body 62a. The hollow-space structure 64a is realized as a continuous hollow space in the handle unit 16a. In the present case, the hollow-space structure 64a is realized as precisely one hollow space. The hollow-space structure 64a extends over a substantial portion of a main extent 66a of the handle unit 16a. The hollow-space structure 64a extends at least approximately from a rear end of the handle unit 16a to a first coupling element 22a of the coupling unit 20a.

[0183]In at least one plane parallel to a main extension plane 80a of the handle unit 16a, the hollow-space structure 64a is completely enclosed by the material volume body 62a. In the main extension plane 80a of the handle unit 16a, the hollow-space structure 64a is completely enclosed by the material volume body 62a. In at least one cross section transverse to a main extension direction 26a of the handle unit 16a, the hollow-space structure 64a is surrounded by the material volume body 62a. The volume body 62a has at least one recess 68a, 70a, 72a, 74a, via which the hollow-space structure 64a is connected to an environment. The material volume body 62a has several defined recesses 68a, 70a, 72a, 74a. Apart from the recesses 68a, 70a, 72a, 74a, the material volume body 62a completely delimits the hollow-space structure 64a. The recesses 68a, 70a, 72a, 74a are realized so as to be unconnected, each having a cross-section area of at most 2.5 cm². The hollow-space structure 64a is arranged in the voluminous portions of the handle unit 16a. In a region delimiting the hollow-space structure 64a, the material volume body 62a has a small wall thickness. The material volume body 62a has at least three recesses 68a, 70a, 72a, 74a via which the hollow-space structure 64a is connected to an environment in at least one direction respectively. Herein the directions are in each case angled by at least 80° relative to one another, starting from a geometric center point of the hollow-space structure 64a. The recesses 68a, 70a, 72a, 74a have different orientations. Furthermore, the recesses 68a, 70a, 72a, 74a in each case do not extend completely through the handle unit 16a. The recesses 68a, 70a, 72a, 74a form a pattern on a surface of the handle unit 16a. The resulting pattern is in particular symmetrical to the longitudinal axis 38a.

[0184]The material volume body 62a has at least two substantially oval recesses 68a, 70a. The material volume body 62a has at least one first oval recess 68a and at least one second oval recess 70a. The at least one first recess 68a is arranged on the front side 82a of the handle unit 16a. The at least one second recess 70a is arranged on the rear side 84a of the handle unit 16a. The second recess 70a is arranged on a rear side 84a of the handle unit 16a, along the main extension direction 26a of the handle unit 16a offset with respect to the first recess 68a on the front side 82a. The first recess 68a and the second recess 70a are thus not congruent. The material volume body 62a has several first recesses 68a and several second recesses 70a, wherein the first and second recesses 68a, 70a alternate along the longitudinal axis 38a, such that the recesses 68a on the front side 82a and the recesses 70a of the rear side 84a alternate. The material volume body 62a has two to eight, preferably two to six, first recesses 68a and two to eight, preferably two to six, second recesses 70a. By way of example, the material volume body 62a has precisely three first recesses 68a and precisely three second recesses 70a. Herein smaller and larger recesses 68a, 70a are provided, wherein the smaller recesses 68a, 70a have a length of 12 mm to 21 mm, preferably of 14 mm to 18 mm, and larger recesses 70a have a length of 20 mm to 38 mm, preferably of 28 mm to 35 mm. Precisely one larger second recess 70a is arranged in a region of an embossing surface 100a. The larger second recess 70a is realized as a lowermost second recess 70a. No larger first recesses 68a are provided. The width of the individual recess 68a, 70a is 4 mm to 13 mm, preferably 5.5 mm to 11 mm. On each side the distance between the recesses 68a, 70a is in the case of the smaller recesses 68a, 70a 20 mm to 45 mm, preferably 25 mm to 35 mm, from the center of the recess 68a, 70a to the center of the recess 68a, 70a. Furthermore, the recesses 68a, 70a are in each case laterally delimited on both sides by a wall 102a of the material volume body 62a, wherein a wall thickness laterally of the oval recesses 68a, 70a is 1 mm to 8 mm, preferably 1.5 mm to 5 mm. Respectively one web 104a is arranged between the first recesses 68a. Furthermore, respectively one web 106a is likewise arranged between the second recesses 70a. The webs 104a, 106a are realized at least partially in an X-shape. The recesses 68a, 70a are delimited in the longitudinal direction by the webs 104a, 106a of the material volume body 62a. The webs 104a, 106a have a minimum width of 2.5 mm to 5 mm, preferably 3 mm to 4 mm, and a maximum width, in particular in a region of the embossing surface 100a, of 6 mm to 12 mm, preferably 7 mm to 10 mm. A lowermost web 104a on the front side 82a forms the embossing surface 100a. The embossing surface 100a serves to provide a surface for applying lettering or logos, for example by embossing. The first recesses 68a extend on the front side 82a in each case as far as the web 106a on the rear side 84a, while the second recesses 70a on the rear side 84a extend as far as a web 104a on the front side 82a. The oval recesses 68a, 70a extend at least substantially perpendicularly to a main extension plane 80a of the handle unit 16a, wherein the oval recesses 68a, 70a extend through a middle plane that extends parallel to the main extension plane 80a through a geometric center point of the handle unit 16a. This in particular results in a small height of the webs 104a, 106a. The height of the webs 104a, 106a is 0.5 mm to 4 mm, preferably 1 mm to 2.5 mm. The first recesses 68a are arranged on a front side 82a of the handle unit 16a, distributed along a middle axis. The second recesses 70a are arranged on the rear side 84a of the handle unit 16a and are offset with respect to the first recesses 68a. The second recesses 70a are arranged along the longitudinal axis 38a, in each case with a center point offset with respect to the first recesses 68a. The second recesses 70a are always arranged along the longitudinal axis 38a between the first recesses 68a. In particular, break-throughs which form the hollow-space structure are realized between the recesses 68a, 70a. The break-throughs are the result of intersecting recesses 68a, 70a. The first recesses 68a and the second recesses 70a are arranged in such a way that they overlap in an inner space of the handle unit 16a. All the first and second recesses 68a, 70a are connected to one another via break-throughs, such that a large hollow space is formed which extends over a large portion of a main extent 66a of the handle unit 16a.

[0185]The material volume body 62a moreover has at least two at least substantially semi-oval recesses 72a, which are arranged on a front side 82a of the handle unit 16a. The at least substantially semi-oval recesses 72a are arranged along the main extension direction 26a of the handle unit 16a at a level of the second oval recesses 70a. The semi-oval recesses 72a on the front side 82a are arranged opposite the second oval recesses 70a. On the front side 82a, the semi-oval recesses 72a are arranged laterally offset with respect to the first oval recesses 68a. The material volume body 62a has on the front side 82a two to sixteen, preferably two to twelve, semi-oval recesses 72a. By way of example, the material volume body 62a has precisely six semi-oval recesses 72a. The semi-oval recesses 72a are arranged on an outer edge of the front side 82a. On the front side 82a, the lowermost semi-oval recesses 72a are realized as larger recesses 72a, wherein the embossing surface 100a is arranged between the larger semi-oval recesses 72a. The semi-oval recesses 72a on the front side 82a are respectively arranged to the left and to the right of the webs 104a. The semi-oval recesses 72a are respectively arranged on the front side 82a as pairs, wherein the pairs of semi-oval recesses 72a are respectively arranged on both sides of the longitudinal axis 38a at the same height. The semi-oval recesses 72a open into one of the second oval recesses 70a. The semi-oval recesses 72a on the front side 82a respectively form a break-through to a second oval recess 70a on the rear side 84a. The break-throughs are realized at least partially laterally and towards the front side 82a. On the front side 82a, the semi-oval recesses 72a respectively form the last recesses 68a, 70a, 72a, 74a at the bottom. On the front side 82a, the semi-oval recesses 72a respectively form a termination at the bottom. On the rear side 84a, the large second oval recess 70a forms the last recess 68a, 70a, 72a, 74a at the bottom. On the rear side 84a, the large second oval recess 70a forms a termination at the bottom. The semi-oval recesses 72a extend as far as the lateral edge of the handle unit 16a. The semi-oval recesses 72a are open towards one side and taper out towards an edge of the volume body 62a.

[0186]The material volume body 62a furthermore has at least two further recesses 74a, which are at least substantially semi-oval and are arranged on a rear side 84a of the handle unit 16a. The further semi-oval recesses 74a are arranged along the main extension direction 26a of the handle unit 16a at a level of the first oval recess 68a. On the rear side 84a, the further semi-oval recesses 74a are arranged laterally offset with respect to the second oval recesses 70a. The material volume body 62a has on the rear side 84a two to sixteen, preferably two to twelve, further semi-oval recesses 74a. By way of example, the material volume body 62a has on the rear side 84a six further semi-oval recesses 74a. The further semi-oval recesses 74a are arranged on an outer edge of the rear side 84a. The further semi-oval recesses 74a are respectively arranged as pairs on the rear side 84a, wherein the pairs of semi-oval recesses 74a are respectively arranged on both sides of the longitudinal axis 38a at the same level. The further semi-oval recesses 74a open into one of the first oval recesses 68a. The further semi-oval recesses 74a on the rear side 84a respectively form a break-through to one of the first oval recesses 68a on the front side 82a. The break-throughs are realized at least partly laterally and towards a front side. The further semi-oval recesses 74a extend as far as the lateral edge of the handle unit 16a. The further semi-oval recesses 74a are open towards a side and taper out towards an edge of the volume body 62a.

[0187]The at least substantially semi-oval recesses 72a, 74a extend at least substantially perpendicularly to a main extension plane 80a of the handle unit 16a, wherein the semi-oval recesses 72a, 74a do not extend through a middle plane that extends parallel to the main extension plane 80a through a geometric center point of the handle unit 16a. The semi-oval recesses 72a, 74a are introduced into the volume body 62a at least substantially perpendicularly to the main extension plane 80a of the handle unit 16a.

[0188]The first oval recesses 68a, the second oval recesses 70a and the semi-oval recesses 72a, 74a are larger in a longitudinal direction than in a transverse direction. The semi-oval recesses 72a, 74a form lateral interruptions in the outer shape of the volume body 62a, wherein a continuous web 108a, which forms the walls 102a, is provided on both sides-in each case in the longitudinal direction-between the semi-oval recesses 72a of the front side 82a and the further semi-oval recesses 74a of the rear side 84a. A shape separation 110a extends on the webs 108a. The shape separation 110a has a continuous progression without jumps and proceeds continuously towards the coupling unit 20a and/or the neck region 98a of the application unit 12a.

[0189]Furthermore, there is an imaginary straight line which extends perpendicularly to the main extension plane 80a of the handle unit 16a and which extends free from an intersection point with the material volume body 62a through the first oval recess 68a and the second oval recess 70a. The imaginary straight line herein extends through a break-through between the first oval recess 68a and the second oval recess 70a. Furthermore, there is an imaginary straight line which extends perpendicularly to the main extension plane 80a of the handle unit 16a and which extends free from an intersection point with the material volume body 62a through one of the semi-oval recesses 72a and the at least one second oval recess 70a. There is also an imaginary straight line which extends perpendicularly to the main extension plane 80a of the handle unit 16a and which extends free from an intersection point with the material volume body 62a through one of the further semi-oval recesses 74a and the at least one first oval recess 68a. Furthermore, there is an imaginary straight line which extends parallel to the main extension plane 80a of the handle unit 16a and perpendicularly to the longitudinal axis 38a and which extends free from an intersection point with the material volume body 62a through two of the semi-oval recesses 72a and the at least one second oval recess 70a. There is moreover an imaginary straight line which extends parallel to the main extension plane 80a of the handle unit 16a and perpendicularly to the longitudinal axis 38a and which extends free from an intersection point with the material volume body 62a through two of the further semi-oval recesses 74a and the at least one first oval recess 68a.

[0190]The material volume body 62a is sloped towards one of the first oval recesses 68a and forms a thumb-gripping region 86a. The material volume body 62a is sloped towards the uppermost first oval recess 68a and forms the thumb-gripping region 86a. One of the webs 104a on the front side 82a, and the walls 102a of the material volume body 62a which delimit the uppermost first oval recess 68a, are chamfered towards the uppermost first oval recess 68a. The thumb-gripping region 86a is realized partly with the chamfer and partly with the recess 68a. The uppermost first oval recess 68a is realized in the shape of an ellipse with a longitudinal axis in the direction of the longitudinal axis 38a of the handle unit 16a. As a result, a depression is formed which allows optimum placement of the thumb. On a rear side facing away from the thumb-gripping region 86a, one of the webs 106a is arranged which is at the rear rounded concavely against the longitudinal axis 38a for a placement of the index finger. The web 106a forms an index finger gripping region 112a.

[0191]The oral hygiene means 10a further comprises the coupling unit 20a for a releasable coupling of the application unit 12a with the handle unit 16a. The coupling unit 20a serves for an exchange of the application unit 12a on the handle unit 16a. The coupling unit 20a comprises the first coupling element 22a. The coupling unit 20a further comprises a second coupling element 24a, which corresponds to the first coupling element 22a. The first coupling element 22a forms an interface projection while the second coupling element 24a forms an interface receptacle. The second coupling element 24a delimits an interface receptacle. The first coupling element 22a is fixedly connected with the handle unit 16a. The first coupling element 22a is realized integrally with the handle unit 16a. The first coupling element 22a is realized integrally with the material volume body 62a. The first coupling element 22a is realized integrally with the material volume body 62a on a side of the handle unit 16a that faces towards the application unit 12a. The first coupling element 22a is realized as an interface projection which at least partially projects from the volume body 62a of the handle unit 16a. The second coupling element 24a is realized fixedly with the application unit 12a. The second coupling element 24a is realized integrally with the base body 14a of the application unit 12a. The second coupling element 24a is arranged on a side of the application unit 12a that faces away from the head region 94a. The second coupling element 24a is arranged at an end of the neck region 98a that faces away from the head region 94a. The second coupling element 24a is arranged in the neck region 98a of the application unit 12a. The coupling unit 20a is configured for a rotationally fix coupling of the first coupling element 22a with the second coupling element 24a.

[0192]The first coupling element 22a comprises a base body 34a having a conical basic shape. A middle axis 36a of the base body 34a is angled with respect to a longitudinal axis 38a of the handle unit 16a. The conical basic shape is constructed so as to be straight in itself, wherein the rear side—and thus the outer cone surface—of the base body 34a is interrupted by an orientation groove 28a. The angle of the outer cone surfaces of the base body 34a with respect to the longitudinal axis of the base body 34a is 4° to 15°, preferably 5.5° to 9°, the outer cone surfaces being symmetrical. The length of the base body 34a on the side, measured on the surface and measured from the free end to a transition edge to the handle unit 16a, is 8 mm to 30 mm, preferably 15 mm to 25 mm. Furthermore, the length of the base body 34a on the front side, measured on the surface and measured from the free end to a transition edge to the handle unit 16a, is 15 mm to 35 mm, preferably 22 mm to 32 mm. The length of the base body 34a on the rear side, measured on the surface and measured from the free end to a transition edge to the handle unit 16a, is 10 mm to 30 mm, preferably 17 mm to 27 mm. The width of the base body 34a, measured from side to side at the highest point of a transition geometry from the handle unit 16a to the base body 34a, and measured perpendicular to the plug-on direction, is 5 mm to 15 mm, preferably 7 mm to 11 mm. Furthermore, the width of the base body 34a, measured from side to side at the free end and measured perpendicular to the longitudinal axis 38a, is 2 mm to 10 mm, preferably 4 mm to 6 mm.

[0193]The second coupling element 24a has a ring-shaped base body 44a. The ring-shaped base body 44a is open downwards, towards the handle unit 16a and tapers conically towards the application unit 12a. The ring-shaped base body 44a is realized so as to correspond to the base body 34a of the first coupling element 22a. The base body 44a has a material thickness of 0.5 mm to 3 mm, preferably of 1 mm to 2 mm. The base body 44a has a material thickness that provides a certain flexibility.

[0194]Furthermore, the first coupling element 22a delimits an orientation groove 28a extending at least substantially along a main extension direction 26a of the handle unit 16a. The base body 34a delimits the orientation groove 28a. The orientation groove 28a extends over an entire extent of the first coupling element 22a. The orientation groove 28a is arranged on a rear side of the first coupling element 22a. Further, the orientation groove 28a is open towards the rear and towards the top. Towards a free end, towards the application unit 12a, the orientation groove 28a is open. Towards the handle unit 16a, the orientation groove 28a is closed and merges into the handle unit 16a. The orientation groove 28a extends along the longitudinal axis 38a of the oral hygiene means 10a over an entire extent of the first coupling element 22a. The orientation groove 28a runs in a straight line. A bottom of the orientation groove 28a runs at least approximately parallel to a main extension direction of the first coupling element 22a. An angle between the bottom of the orientation groove 28a and the longitudinal axis 38a is 1° to 10°, preferably 1° to 5°. A depth of the orientation groove 28a increases from a free end towards the handle unit 16a. The orientation groove 28a is arranged such that a middle axis is offset from the longitudinal axis 38a of the oral hygiene means 10a. The length of the orientation groove 28a, measured at the bottom of the orientation groove 28a, is 10 mm to 30 mm, preferably 15 mm to 25 mm. The width of the orientation groove 28a at the free end is 1.5 mm to 5 mm, preferably 2 mm to 3.5 mm, wherein in particular demolding slopes and/or insertion slopes are provided in the longitudinal direction. At an end facing towards the handle unit 16a, the orientation groove 28a has at the bottom a width of 1.5 mm to 5 mm, preferably 2 mm to 2.5 mm, and at the top a width of 2 mm to 6 mm, preferably 2.5 mm to 3 mm. Furthermore, the orientation groove 28a in particular has at its free end a depth of 1 mm to 6 mm, preferably 2 mm to 4 mm, and at the end facing towards the handle unit 16a it has a depth of 2 mm to 8 mm, preferably 3 mm to 5 mm. The orientation groove 28a has a rounded, preferably C-shaped cross section.

[0195]The second coupling element 24a furthermore has an inside-situated guide ridge 30a extending at least substantially along a main extension direction 32a of the application unit 12a. The guide ridge 30a is encompassed by the ring-shaped base body 44a. The guide ridge 30a is configured to engage in the orientation groove 28a in a coupled state of the coupling unit 20a. The guide ridge 30a can be introduced into the orientation groove 28a in different rotational positions around a longitudinal axis 38a of the oral hygiene means 10a, wherein with increasing engagement of the first coupling element 22a in the second coupling element 24a, the second coupling element 24a is oriented into a final angle position. The guide ridge 30a projects perpendicularly to a middle axis of the second coupling element 24a into a receiving region of the second coupling element 24a for the first coupling element 22a. The guide ridge 30a starts directly at an open end of the second coupling element 24a and extends in the receiving region of the second coupling element 24a for accommodating the first coupling element 22a. The guide ridge 30a is realized integrally with the application unit 12a. The guide ridge 30a is furthermore arranged symmetrically on the longitudinal middle axis. At an end facing towards the handle unit 16a, the guide ridge 30a has a height of 3 mm to 7 mm, preferably of 4 mm to 6 mm, and at an end facing towards the application unit 12a in the receiving region, the guided ridge 30 has a height of 1 mm to 5 mm, preferably of 1.5 mm to 3.5 mm. The guide ridge 30a furthermore has on its crest a width of 1 mm to 3.5 mm, preferably of 1.5 mm to 2.5 mm, wherein the crest is of rounded design. Where it starts at a base body 44a of the second coupling element 24a, the guide ridge 30a has a width of 1 mm to 5 mm, preferably of 1.5 mm to 3.5 mm. A length of the guide ridge 30a, measured at the upper edge of the crest, is 10 mm to 40 mm, preferably 15 mm to 30 mm. The guide ridge 30a has a triangular cross section in a plane perpendicular to the longitudinal direction.

[0196]Furthermore, the first coupling element 22a comprises a first latching means 40a. The first latching means 40a is realized as a latching projection. The first latching means 40a is arranged in the orientation groove 28a. The first latching means 40a is arranged in an end region of the orientation groove 28a that faces towards the handle unit 16a. The first latching means 40a is arranged on a bottom of the orientation groove 28a. The first latching means 40a is realized as a trapezoidal elevation in the orientation groove 28a. In a plane parallel to the longitudinal axis of the first coupling element 22a, the first latching means 40a has a trapezoidal cross section. The first latching means 40a has a height of 0.2 mm to 1.2 mm, preferably of 0.4 mm to 0.8 mm. The first latching means 40a furthermore extends over an entire width of the orientation groove 28a. The first latching means 40a further has at the top, on a plateau of the trapezoidal cross section, a length of 0.2 mm to 1 mm, preferably of 0.3 mm to 0.7 mm. Furthermore, the first latching means 40a has at the bottom, where it starts, a length of 1 mm to 5 mm, preferably of 2 mm to 3 mm. An angle of the legs of the trapezoidal cross section is 10° to 60°, preferably 20° to 40°. A distance between the first latching means 40a and the free end of the first coupling element 22a, measured along the longitudinal axis 38a from a center of the first latching means 40a, is 7 mm to 40 mm, preferably 15 mm to 25 mm.

[0197]Furthermore, the second coupling element 24a comprises, on a crest of the guide ridge 30a, a second latching means 42a, which is realized correspondingly to the first latching means 40a. The second latching means 42a is realized as a latching recess. The second latching means 42a is arranged in an end region of the second coupling element 24a that faces towards the handle unit 16a. The second latching means 42a is realized as a depression. The depression in particular has a depth of 0.15 mm to 0.55 mm, preferably of 0.25 mm to 0.45 mm. The second latching means 42a furthermore extends over an entire width of the guide ridge 30a. The length of the second latching means 42a that is realized as a depression is in the longitudinal direction 0.2 mm to 1.2 mm, preferably 0.2 mm to 0.8 mm. The side surfaces of the second latching means 42a that is realized as a depression have an angle of 10° to 60°, preferably of 20° to 40°, relative to the crest of the guide ridge 30a. The second latching means 42a is realized so as to correspond to the first latching means 40a. The guide ridge 30a further comprises, between the second latching means 42a and a fastening region 46a of the guide ridge 30a, in which the guide ridge 30a is connected to the base body 44a, a recess 48a that is configured to enable a deflection of the second latching means 42a towards the fastening region 46a. The recess 48a provides a certain flexibility for the second latching means 42a in the guide ridge 30a, since the depression and/or its edges may deflect somewhat.

[0198]The first coupling element 22a further comprises a further latching means 50a, which is arranged on a side of a base body 34a of the first coupling element 22a which is situated opposite the orientation groove 28a. The further latching means 50a is realized as a latching recess. The further latching means 50a is realized as a third latching means 50a and is arranged on a front side of the first coupling element 22a. The further latching means 50a is realized as a latching recess having a trapezoidal cross section. The side walls of the trapezoidal cross section have an angle of 100° to 175°, preferably 130° to 170°, with respect to the bottom. The third latching means 50a is realized symmetrically.

[0199]The length of the side walls results from the angles and from the intersection with the cone surface of the base body 34a of the first coupling element 22a. The third latching means 50a that is realized as a depression has a depth of 0.5 mm to 2 mm, preferably of 1 mm to 1.7 mm. In terms of width, the third latching means 50a extends over the entire cone from left to right. No lateral boundary is provided. A length of the third latching means 50a in the longitudinal axis direction, at the top at the opening of the depression, is 3 mm to 8 mm, preferably 4.5 mm to 6.5 mm. At the bottom, the length is 0.2 mm to 2 mm, preferably 0.5 mm to 1.2 mm. The third latching means 50a of the first coupling element 22a is arranged in a first end region 52a of the first coupling element 22a that faces towards the handle unit 16a. A distance between the third latching means 50a and a free end of the first coupling element 22a along the longitudinal axis 38a, measured from a center of the third latching means 50a, is 10 mm to 50 mm, preferably 15 mm to 30 mm. A distance between the first latching means 40a and the third latching means 50a along the longitudinal axis 38a, measured from a center of the first latching means 40a to a center of the third latching means 50a, is 2 mm to 10 mm, preferably 3 mm to 6 mm.

[0200]The further latching means 50a of the first coupling element 22a is substantially larger than the first latching means 40a of the first coupling element 22a.

[0201]The second coupling element 24a further comprises a fourth latching means 114a, which is realized as a latching projection and is realized correspondingly to the third latching means 50a. The second coupling element 24a comprises two latching means 42a, 114a, namely the fourth latching means 114a on the front side, which is realized as a latching projection, in particular a latching cam, and the second latching means 42a on the rear side of the second coupling element 24a, which is realized as a depression. The fourth latching means 114a has a trapezoidal cross section. The fourth latching means 114a laterally has a direct transition to the base body 44a, such that no ledge is formed. The maximum height of the fourth latching means 114a relative to the surrounding geometry is 0.2 mm to 1.3 mm, preferably 0.4 mm to 1 mm. The width of the fourth latching means 114a substantially corresponds to a width of the receiving region of the second coupling element 24a. The fourth latching means 114a extends over an entire width of the receiving region of the second coupling element 24a. Furthermore, the length of the fourth latching means 114a in the longitudinal direction is at the top, on an elevation of the trapezoidal cross section, 1.5 mm to 6 mm, preferably 2.5 mm to 4.5 mm. The angle of the legs of the trapezoidal cross section of the fourth latching means 114a, measured from the base body 44a, is 10° to 60°, preferably 20° to 40°.

[0202]The fourth latching means 114a of the second coupling element 24a is substantially larger than the second latching means 42a of the second coupling element 24a.

[0203]Beyond this, the first coupling element 22a comprises at least two supporting projections 54a, 56a, which are arranged on an outer side of the base body 34a and are configured, in a coupled state of the coupling unit 20a, to bear against an inner side of a base body 44a of the second coupling element 24a. The supporting projections 54a, 56a have an at least approximately rectangular or trapezoidal basic shape. The supporting projections 54a, 56a have a shape that follows the cone of the base body 34a. The supporting projections 54a, 56a are of substantially trapezoidal design, wherein a widest region points downwards. The shapes of the supporting projections 54a, 56a are adapted to a demolding. The edges of the supporting projections 54a, 56a are rounded. The supporting projections 54a, 56a are connected to the base body 34a of the first coupling element 22a via rounded edges. The supporting projections 54a, 56a have a height of 0.1 mm to 0.5 mm, preferably of 0.1 mm to 0.3 mm. The supporting projections 54a, 56a are configured to compensate tolerances. The width of the supporting projections 54a, 56a transverse to the longitudinal axis 38a is at most 1.5 mm to 4 mm, preferably 2 mm to 3 mm, and at least 0.5 mm to 3 mm, preferably 1 mm to 2 mm. A length of the supporting projections 54a, 56a along the longitudinal axis 38a is 1 mm to 7 mm, preferably 1.5 mm to 6 mm. Herein the length of the supporting projections 54a, 56a depends on a position of the respective supporting projection 54a, 56a. The supporting projections 54a, 56a are arranged in several positions and on different sides, offset in the longitudinal axis direction and around the base body 34a. The supporting projections 54a, 56a are arranged symmetrically to the longitudinal axis 38a.

[0204]The first coupling element 22a comprises at least six primary supporting projections 54a of the supporting projections 54a, 56a, which are arranged in a band in a first end region 52a of the first coupling element 22a, which faces towards the handle unit 16a. The primary supporting projections 54a are arranged in the band partially offset with respect to one another along the longitudinal axis 38a, wherein the primary supporting projections 54a are arranged in such a way that they overlap along the longitudinal axis 38a. Measured along the longitudinal axis 38a, an upper edge of the band is spaced apart from the free end of the interface by 6 mm to 21 mm, preferably by 11 mm to 16 mm. The orientation groove 28a on the rear side extends through the band of primary supporting projections 54a. Measured in the longitudinal direction along the longitudinal axis 38a, the width of the band is 3 mm to 12 mm, preferably 5 mm to 8 mm. Measured along the longitudinal axis 38a, the minimum distance from the band to the handle unit 16a is 0.5 mm to 5 mm, preferably 1 mm to 3 mm. A number of the primary supporting projections 54a in said band is 4 to 10, preferably 5 to 7. By way of example, precisely six primary supporting projections 54a are provided, wherein all primary supporting projections 54a are arranged in the band. Different shapes and/or lengths of the supporting projections 54a are arranged in the band. Two primary supporting projections 54a are provided on the rear side at the orientation groove 28a. The two primary supporting projections 54a on the rear side are realized as long supporting projections 54a. In the case of said supporting projections 54a, one side bears against the groove edge of the orientation groove 28a. The two primary supporting projections 54a on the rear side have a length of 3 mm to 8 mm, preferably 4 mm to 6 mm, and a width of 0.5 mm to 3.5 mm, preferably 1 mm to 2.5 mm. Furthermore, two long primary supporting projections 54a are provided on the front side, which are arranged at a position in the band to the left and to the right of the center respectively. The long primary supporting projections 54a on the front side have a length of 1.5 mm to 6 mm, preferably 2.5 mm to 4 mm, and a maximum width of 1 mm to 5 mm, preferably 1.5 mm to 3 mm. Furthermore, two short primary supporting projections 54a are provided, which are arranged laterally. The short primary supporting projections 54a have a length of 1 mm to 5 mm, preferably 1.5 mm to 3 mm, and a maximum width of 0.7 mm to 4 mm, preferably 1.2 mm to 2.5 mm. By means of the supporting projections 54a, a support of the second coupling element 24a over small surfaces is achievable.

[0205]The first coupling element 22a comprises at least three secondary supporting projections 56a, which are arranged in a band in a second end region 58a of the first coupling element 22a, which faces away from the handle unit 16a. The number of secondary supporting projections 56a in said band is one to six, preferably two to four. By way of example, the first coupling element 22a comprises precisely three secondary supporting projections 56a, all of which are arranged in said band. The band of secondary supporting projections 56a is in particular arranged at the very end of the base body 34a directly at the edge. An edge of the secondary supporting projections 56a forms the terminal edge or a portion of the terminal edge of the base body 34a. The orientation groove 28a extends through the band of secondary supporting projections 56a. The width and/or the height of the band of secondary supporting projections 56a in particular correspond/s to the maximum length of the supporting projections 56a. The lower edges of the secondary supporting projections 56a form a contiguous geometry and are situated on the same plane of the base body 34a. The secondary supporting projections 56a have a length of 1 mm to 6 mm, preferably 2 mm to 4 mm. Of the secondary supporting projections 56a, one supporting projection 56a is arranged on the longitudinal axis 38a and two secondary supporting projections 56a are arranged symmetrically laterally directly at the edge of the base body 34a and directly at an edge of the orientation groove 28a. Herein an upper terminal edge of the base body 34a forms two sides of the base surface of the secondary supporting projections 56a.

[0206]The first coupling element 22a is free of supporting projections 54a, 56a in a middle region 59a that is arranged between the first end region 52a and the second end region 58a. Measured along the longitudinal axis 38a, measured between the terminal edges of the bands on the cone surface, a distance between the band of primary supporting projections 54a and the band of secondary supporting projections 56a is 5 mm to 15 mm, preferably 8 mm to 12 mm. No further supporting projection 54a, 56a is arranged between the bands.

[0207]On a side facing towards the first coupling element 22a, the handle unit 16a has an end face 60a with a wave-shaped geometry. Following the geometry of the end face 60a, the first coupling element 22a is connected with the handle unit 16a on the end face 60a of the handle unit 16a. The wave-shaped end face 60a of the handle unit 16a forms a transition geometry, wherein the first coupling element 22a adjoins the end face 60a with a step. The wave-shaped end face 60a also extends into the orientation groove 28a and forms an end wall of the orientation groove 28a, wherein in order to enable demolding, a last portion of the end wall deviates from the outer wave shape of the end face 60a at a transition to the bottom. The wave-shaped end face 60a has a width that is constant perpendicular to a longitudinal axis 38a. A ledge from the first coupling element 22a to the handle unit 16a is provided on the end face 60a. A width of the ledge corresponds to the material thickness of the base body 44a of the second coupling element 24a, such that a continuous surface is formed in the plugged-on state. The second coupling element 24a has, on the base body 44a, an end face 128a that corresponds to the end face 60a. The ledge of the end face 60a has a width of 0.5 mm to 4 mm, preferably 0.5 mm to 2 mm. The ledge of the end face 60a includes an angle of at least approximately 90° with the longitudinal axis 38a. The ledge continues on the rear side, in particular into the orientation groove 28a. The profile of the end face 60a is visible on the surface of the plugged-together oral hygiene means 10a. The profile has a rounded shape and/or round transitions. In a circumferential wave-shaped geometry, the end face 60a forms a height profile that is lowered at the front and at the rear and is raised laterally to the left and right. The lowermost point on the front side 82a and on the rear side 84a is located in each case on the longitudinal axis 38a. A height difference between a front and a rear, measured along the longitudinal axis 38a, is 2 mm to 7 mm, preferably 3 mm to 5 mm. A height difference between the front and the side, measured along the longitudinal axis 38a, is 3 mm to 9 mm, preferably 5 mm to 7 mm. A height difference between the rear and the side, measured along the longitudinal axis 38a, is 1 mm to 4 mm, preferably 1.5 mm to 2.5 mm. The height profile is designed such that the height difference is smaller at the rear than at the front. An angle between the front and the side, with respect to the longitudinal axis 38a, is 35° to 75°, preferably 45° to 65°. An angle between the rear and the side, with respect to the longitudinal axis 38a, is 10° to 50°, preferably 20° to 35°. The angle is steeper towards the front than towards the rear.

[0208]Three further exemplary embodiments of the invention are shown in FIGS. 30 to 41. The following descriptions are essentially limited to the differences between the exemplary embodiments, wherein with regard to components, features and functions that remain the same, reference may be made to the description of the other exemplary embodiments, in particular of FIGS. 1 to 29. In order to distinguish between the exemplary embodiments, the letter a in the reference numerals of the exemplary embodiment of FIGS. 1 to 29 has been replaced by the letters b, c and d in the reference numerals of the exemplary embodiments of FIGS. 30 to 41. With regard to components having the same denomination, in particular with regard to components having the same reference numerals, reference may in principle also be made to the drawings and/or the description of the other exemplary embodiments, in particular of FIGS. 1 to 29.

[0209]FIG. 30 shows a front side 82b of an oral hygiene means 10b, with an application unit 12b and with a handle unit 16b having a material volume body 62b which forms a base body 18b. The handle unit 16b is connected with the application unit 12b. By way of example, the handle unit 16b and the application unit 12b are realized integrally in this exemplary embodiment, whereas it would also be conceivable for the application unit 12b to be realized so as to be separable from the handle unit 16b via a coupling unit according to the first exemplary embodiment of FIGS. 1 to 29. The at least one application unit 12b comprises a head region 94b. The head region 94b forms a brush head of the oral hygiene means 10b. The head region 94b in particular has a base body that is realized as a bristle carrier. The oral hygiene means 10b further has a cleaning zone 96b, which is accommodated in the head region 94b and comprises a plurality of bristle bundles.

[0210]The handle unit 16b furthermore has at least one substantial hollow-space structure 64b, which is at least substantially delimited by the material volume body 62b. The hollow-space structure 64b is realized as one hollow space or several hollow spaces in the handle unit 16b. In the present case, the hollow-space structure 64b is realized as precisely two hollow spaces. The hollow-space structure 64b extends over a substantial portion of a main extent 66b of the handle unit 16b. The hollow-space structure 64b is realized in two portions, a first portion of the hollow-space structure 64b extending over a front portion of the handle unit 16b that faces towards the application unit 12b, and a second portion of the hollow-space structure 64b extending over a rear portion of the handle unit 16b that faces away from the application unit 12b. The first portion of the hollow-space structure 64b extends as far as a neck region 98b of the application unit 12b. A thumb-gripping region 86b is arranged between the first portion of the hollow-space structure 64b and the second portion of the hollow-space structure 64b. The first portion of the hollow-space structure 64b is arranged partially behind the thumb-gripping region 86b. From the front, the hollow-space structure 64b is at least approximately completely covered by the material volume body 62b. A front side 82b of the material volume body 62b is not realized completely closed, but recesses 76b, 78b are oriented at least substantially perpendicular to the front side 82b.

[0211]The material volume body 62b has in at least one region at least five strand elements 88b, 90b, 92b, which are spaced apart from one another in a first region of the handle unit 16b and are arranged in a contacting manner in at least one second region of the handle unit 16b. The strand elements 88b, 90b, 92b extend in the form of undulations, which are partially offset with respect to one another. In regions in which the strand elements 88b, 90b, 92b are arranged offset with respect to one another and move away from one another, recesses 76b, 78b are formed in a transverse direction. The recesses 76b, 78b are visible laterally. In a region of the recesses 76b, 78b, cores of the injection-molding tool contact one another for manufacturing, said cores forming the rear side 84b and forming the front side 82b. The recesses 76b, 78b between the strand elements 88b, 90b, 92b extend through the volume body 62b substantially in a transverse direction, wherein the recesses 76b, 78b may also extend through the volume body 62b partially perpendicularly to a main extension plane 80b. Viewed from the front side 82b to the rear side 84b, the recesses 76b, 78b are only slit-shaped and hardly visible. On the rear side 84b, a depression is formed that is delimited by the strand elements 88b, 90b, 92b and forms the hollow-space structure 64b. The depression is realized, towards the rear side 84b, so as to be open towards an environment via a further, large recess 79b. The strand elements 88b, 90b, 92b are not straight.

[0212]The material volume body 62b comprises two outer strand elements 88b, two middle strand elements 90b and one inner strand element 92b. The inner strand element 92b forms a central strand that runs along a longitudinal axis 38b. The middle strand elements 90b adjoin the inner strand element 92b on both sides in the transverse direction. The outer strand elements 88b in turn adjoin the middle strand elements 90b in each case outwards in the transverse direction. The strand elements 88b, 90b, 92b taper in the width and in the height. The strand elements 88b, 90b, 92b in each case form a complete undulation. The strand elements 88b, 90b, 92b form a complete undulation when viewed in the transverse direction. Four strand elements 88b, 90b are provided, which in each case run in a wave-shaped manner when viewed in the transverse direction and when viewed perpendicularly to a main extension plane 80b. The strand elements 88b, 90b, 92b run partially in opposed directions, such that one strand element 88b, 90b, 92b may be rather in the region of a wave trough while another strand element 88b, 90b, 92b is realized rather as a wave crest. Viewed in the transverse direction, the outer strand elements 88b run in an opposed direction to an inner strand element 92b. Viewed perpendicularly to a main extension plane 80b, the outer strand elements 88b run in opposed directions to each other. Viewed perpendicularly to a main extension plane 80b, the middle strand elements 90b run in opposed directions to each other. Furthermore, in each case nodal points are formed between neighboring strand elements 88b, 90b, 92b. The nodal points in each case form contact points of the strand elements 88b, 90b, 92b, in which the strand elements 88b, 90b, 92b are connected. One nodal point is arranged at the bottom at the end of the handle unit 16b. Furthermore, between the middle strand elements 90b and the inner strand element 88b a further nodal point is provided, which is arranged in an upper region of an embossing surface 100b. Furthermore, a further nodal point is provided between all the strand elements 88b, 90b, 92b below a thumb-gripping region 86b. The strand elements 88b, 90b, 92b in each case extend from bottom to top over the entire handle unit 16b, wherein the recesses 76b, 78b decrease in size from bottom to top in the transverse direction. Below the neck region 98b, the strand elements 88b, 90b, 92b taper out in a further nodal point.

[0213]Two first recesses 76b of the lateral recesses 76b, 78b are formed symmetrically on both sides between the inner strand element 92b and the middle strand elements 90b at a level of the embossing surface 100b. Two second recesses 78b of the lateral recesses 76b, 78b are formed symmetrically on both sides between the middle strand elements 90b and the outer strand elements 88b at a level between the embossing surface 100b and the thumb-gripping region 86b. The lateral recesses 76b, 78b have a narrow convex-lens shape.

[0214]The material volume body 62b has five recesses 76b, 78b, 79b, via which the hollow-space structure 64b is connected to an environment in at least one direction respectively. Herein, starting from a geometric center point of the hollow-space structure 64b, the directions are angled by at least 80° relative to one another. Two recesses 76b, 78b open the hollow-space structure 64b to a lefthand side, two recesses 76b, 78b open the hollow-space structure 64b to a righthand side, and one recess 79b opens the hollow-space structure 64b towards the rear side 84b.

[0215]The thumb-gripping region 86b is realized in an upper region of the handle unit 16b. The thumb-gripping region 86b is realized by the strand elements 88b, 90b, 92b, wherein the inner strand element 92b forms the main support surface for the thumb-gripping region 86b. On the main support surface structures are realized which improve holding and reduce a slipping of the thumb. In order for something like a hollow to be realized, the middle and outer strand elements 88b, 90b are in this region realized in a somewhat opposed manner. The outer strand elements 88b form lateral boundaries, in particular lateral elevations. The outer shape of the handle unit 16b is realized laterally by the outer strand elements 88b, while the strand elements 88b, 90b, 92b alternate on the front side 82b and the rear side 84b.

[0216]The material volume body 62b is so as to be symmetrical in the transverse direction, wherein the outer strand elements 88b are mirrored and the middle strand elements 90b are mirrored. The inner strand element 92b is constructed symmetrically in itself and wider than the others. The inner strand element 90b forms the embossing surface 100b at the bottom and forms at the top the major portion of the thumb-gripping region 86b. The inner strand element 90b has a greater width in the region of the embossing surface 100b and of the thumb-gripping region 86b and is waisted between the embossing surface 100b and the thumb-gripping region 86b. Furthermore, the inner strand element 90b tapers narrowly towards a lower end and towards an upper end. The middle strand elements 90b continue the undulating shape of the inner strand element 92b perpendicularly to a main extension plane 80b and are arranged partially offset with respect to the inner strand element 92b. Perpendicularly to a main extension plane 80b, the outer strand elements 88b continue the undulating shape of the middle strand elements 90b and are arranged partially offset with respect to the middle strand elements 90b. A number of strand elements 88b, 90b, 92b is three to nine, preferably three to six. By way of example, precisely five strand elements 88b, 90b, 92b are provided. The outer and the middle strand elements 88b, 90b have a constant width, wherein the inner strand element 92b in particular realizes a profile in the width. The inner strand element 92b has a minimum width of 1 mm to 4 mm, preferably 1.5 mm to 3 mm, and a maximum width of 6 mm to 12 mm, preferably 7 mm to 10 mm. The outer and the middle strand elements 88b, 90b have a width of 0.8 mm to 4 mm, preferably 1 mm to 3 mm. The height of the individual strand elements 88b, 90b, 92b is 2 mm to 7 mm, preferably 2.5 mm to 6 mm. A cross-section area perpendicular to a longitudinal axis of the individual strand elements 88b, 90b, 92b is 4 mm² to 30 mm², preferably 4.5 mm² to 26 mm². The inner strand element 92b has a largest cross-section in the region of the embossing surface 100b or of the thumb-gripping region 86b. A cross-section of the outer and middle strand elements 88b, 90b is substantially constant. The middle strand elements 90b have a smallest cross-section. The strand elements 88b, 90b, 92b have a rectangular cross-section shape. However, a polygonal, round or oval cross-section shape would also be conceivable. The cross-section shape of the handle unit 16b is derived from the arrangement of the strand elements 88b, 90b, 92b.

[0217]In a respective implementation, a shape separation 110b is arranged on the outer strand elements 88b. The shape separation 110b forms a continuous progression, free of jumps, on the outermost strand elements 88b. The shape separation 110b in particular continues towards the application unit 12b. The shape separation 110b is arranged on a middle region with regard to height.

[0218]FIG. 39 shows a front side 82c of an oral hygiene means 10c, in a schematic perspective view. In the present case, the oral hygiene means 10c is realized as a toothbrush. The oral hygiene means 10c is realized as an electric toothbrush. The oral hygiene means 10c is realized as an exchangeable-head toothbrush.

[0219]The oral hygiene means 10c comprises an application unit 12c. The oral hygiene means 10c further comprises a handle unit 16c. The handle unit 16c is realized as an electric handle unit 16c.

[0220]In the following, reference is made to FIGS. 39 and 40, which show two views of the oral hygiene means 10c, the handle unit 16c and the application unit 12c. In particular for the explanations concerning the coupling unit, reference is made to FIGS. 1 to 29, which at least partially also show the coupling unit. The coupling unit 20c with the coupling elements 22c and 24c is designed identically to the coupling unit 20a with the coupling elements 22a and 24a in FIGS. 1 to 29. Depending on the views, some elements are not shown in FIGS. 39 and 40 and are accordingly not provided with reference numerals. Overall, for the coupling unit reference is made to the description mentioned in FIGS. 1 to 29.

[0221]The handle unit 16c is preferably constructed of at least two plastic components. In principle, a hard component forms the “framework” of the handle unit 16c and one or more further components close the open regions. For example, as shown in the figures, a soft component is applied in the region of the on-off button 130c, such that the required manipulations are possible.

[0222]Specifically for an electric toothbrush, the on-off button 130c is situated on the front side of the toothbrush. The handle unit 16c is furthermore of hollow design, thus allowing accommodation of the electrical components in the handle unit 16c. In the present case, the electric toothbrush is a vibration or sonic toothbrush which makes the application unit 12c vibrate. The handle unit 16c is closed at the bottom by a cover 132c, such that the hollow space with the electrical components is closed. The electrical components may comprise, for example, a motor with an eccentric, providing a vibrating movement for cleaning. The power supply of the electric toothbrush is preferably realized via an accumulator accommodated in the hollow space with the further electrical components. The accumulator is charged either inductively via a charger which the handle unit 16c is placed into, or via a physical plug-in connection. The physical plug-in connection is realized, for example, by removing the cover 132c and thus releasing a charging socket. A plug of a power supply unit is then plugged into the charging socket and the accumulator is charged.

[0223]An application unit 12c can be coupled onto the handle unit 16c.

[0224]FIG. 41 shows a front side 82d of an oral hygiene means 10d, with an application unit 12d and with a handle unit 16d having a material volume body 62d which forms a base body 18d. The handle unit 16d is connected with the application unit 12d. By way of example, the handle unit 16d and the application unit 12d are realized integrally in this exemplary embodiment, whereas it would also be conceivable for the application unit 12d to be realized so as to be separable from the handle unit 16d via a coupling unit according to the first exemplary embodiment of FIGS. 1 to 29. The at least one application unit 12d comprises a head region 94d. The head region 94d forms a brush head of the oral hygiene means 10d. The head region 94d in particular has a base body that is realized as a bristle carrier. The oral hygiene means 10d further comprises a cleaning zone 96d, which is accommodated in the head region 94d and comprises a plurality of bristle bundles. The oral hygiene means 10d is realized as a manual toothbrush. The oral hygiene means 10d is realized as an exchangeable-head toothbrush. The oral hygiene means 10d could also be realized as a flosser, as a single-tuft brush, as an interdental cleaner, as a tongue cleaner or the like. In addition, combined oral hygiene means 10d are conceivable, which combine at least two different functions, for example a toothbrush with a tongue cleaner, a toothbrush with massaging elements, or the like.

[0225]The oral hygiene means 10d comprises an application unit 12d. The oral hygiene means 10d further comprises a handle unit 16d. The handle unit 16d is realized as a manual handle unit 16d. The at least one handle unit 16d is made of a single material.

[0226]The oral hygiene means 10d has a longitudinal axis, a height axis and a width axis. The longitudinal axis 38d is arranged parallel to a main extension direction 126d of the oral hygiene means 10d. The longitudinal axis 38d further corresponds to a longitudinal axis of the handle unit 16d. If the oral hygiene means 10d is placed with its rear side on a flat surface, such that the longitudinal axis 38d is arranged parallel to the surface, the height axis 122d is arranged perpendicular to the longitudinal axis 38d and perpendicular to the surface and to the width axis 124d. The width axis 124d is arranged perpendicular to the longitudinal axis 38d and perpendicular to the height axis 122d.

[0227]The application unit 12d is arranged on the upper side of the oral hygiene means 10d. The application unit 12d forms an uppermost point of the oral hygiene means 10d. By way of example, the application unit 12d is made completely of a hard component. However, it would also be conceivable that the application unit 12d is made partially of a soft component and partially of a hard component. With regard to suitable soft and/or hard components, reference is made to the above description. In principle, the application unit 12d may comprise at least one tongue cleaner element. The tongue cleaner element may in particular have nubs and/or lamellae. The tongue cleaner element is preferably arranged on the rear side of the head region 94d, and it may in particular be arranged on a ring made of a soft component and/or on an island made of a hard component.

[0228]The handle unit 16d has a base body 18d. The handle unit 16d furthermore comprises the material volume body 62d and a substantial hollow-space structure 64d. The material volume body 62d forms the base body 18d. The substantial hollow-space structure 64d is at least substantially delimited by the material volume body 62d. The hollow-space structure 64d is realized as a continuous hollow space in the handle unit 16d. In the present case, the hollow-space structure 64d is realized as exactly one hollow space. The hollow-space structure 64d extends over a substantial portion of a main extent 66d of the handle unit 16d. The hollow-space structure 64d extends from a rear end of the handle unit 16d to a thumb-gripping region 86d.

[0229]The volume body 62d has at least one recess 68d, 70d, 72d, 74d, via which the hollow-space structure 64d is connected to an environment. The material volume body 62d has several defined recesses 68d, 70d, 72d, 74d. Apart from the recesses 68d, 70d, 72d, 74d, the material volume body 62d completely delimits the hollow-space structure 64d. The recesses 68d, 70d, 72d, 74d are realized so as to be unconnected. The hollow-space structure 64d is arranged in the voluminous portions of the handle unit 16d. In a region delimiting the hollow-space structure 64d, the material volume body 62d has a small wall thickness. The recesses 68d, 70d, 72d, 74d in each case do not extend completely through the handle unit 16d. The recesses 68d, 70d, 72d, 74d form a pattern on a surface of the handle unit 16d. The resulting pattern is in particular symmetrical to the longitudinal axis 38d.

[0230]The material volume body 62d has a plurality of essentially hexagonal recesses 68d, 70d, 72d on all four longitudinal sides. Herein first recesses 68d of the recesses 68d, 70d, 72d, 74d are oriented completely towards the front side 82d. Herein second recesses 70d of the recesses 68d, 70d, 72d, 74d are oriented completely towards a rear side 84d. Herein third recesses 72d of the recesses 68d, 70d, 72d, 74d are oriented towards one side. Herein fourth recesses of the recesses 68d, 70d, 72d, 74d are oriented towards another side. The recesses 68d, 70d, 72d are realized in different sizes, such that the smallest recesses 68d, 70d, 72d are realized on the side of a neck region 98d and the largest recesses 68d, 70d, 72d are realized in the middle region of the handle unit 16d. Overall, the recesses 68d, 70d, 72d form a row from bottom to top, wherein the size of the recesses 68d, 70d, 72d undergoes a progression. The medium size is realized at the bottom, the size extends to the largest size in the middle and then to the smallest size adjoining the neck region 98d. The recesses 68d, 70d, 72d are arranged along the longitudinal axis 38d. The recesses 68d, 70d on the front side 82d and on the rear side 84d of the handle unit 16d are aligned on the same axis, while the recesses 72d on the lefthand and righthand sides of the handle unit 16d are likewise aligned on the same axis. These two groups of recesses 68d, 70d, 72d are arranged on the handle unit 16d in such a way that they alternate and/or are arranged within one another.

[0231]A respective web 104a, 106a is arranged between the recesses 68d, 70d, 72d. The recesses 68d, 70d, 72d are delimited in the longitudinal direction by the webs 104a, 106a of the material volume body 62d. The recesses 68d, 70d, 72d in each case extend into the hollow-space structure 64d. In particular, between the recesses 68d, 70d, 72d break-throughs are realized which form the hollow-space structure 64d. The break-throughs are the result of intersecting or contacting recesses 68d, 70d, 72d. The recesses 68d, 70d, 72d are connected to one another via break-throughs, such that a large hollow space is formed which extends over a large portion of a main extent of the handle unit 16d.

[0232]Along the longitudinal axis 38d, a recess 74d is realized from the underside. This recess 74d merges into the hollow-space structure 64d which connects the other recesses 68d, 70d, 72d and/or is realized by the other recesses.

REFERENCE NUMERALS